Hi, I was wondering how do you say this in Munster Irish: I do not know how to do it / I do not know what to do. I would say níl a fhios agam conas a... And the other sentence with cad. I guess déanamh is different in Munster Irish?

I think a way of saying I don't know what to do would be:
Ní fheadar cad atá le déanamh agam = I don't know what to do (in the sense of what is to be done)
or
Níl a fhios agam cad is ceart a dhéanamh. (Probably closer to your original intention)

Although I could be wrong.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

I often read that, but it looks very much like a Béarlachas (I don't know if it is).

In Ulster Irish I'd say:

Níl a fhios agam cad é mar a ghéanfainn é (ie. I dunno how I would to it)
Níl a fhios agam cad é ba chóir a dhéanamh (ie. I dunno what would be right to do), or
Níl a fhios agam cad é a ghéanfainn (ie. I dunno what I would do)

If we use the same patterns, in Munster Irish it'd be:

Ní fheadar conas a dhéanfainn é
Ní fheadar cad ba chóir a (do) dhéanamh, or
Ní fheadar cad a dhéanfainn

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Interesting, then - I dunno - is not níl a fhios agam in Munster?

Well you never say "Is feadar", always "Tá a fhios agam". Feadar
is only used in the negative and in questions. It tends to be used
over "Tá a fhios ...." when some kind of copula construction
comes in. At least thats what I've found, e.g.

Ní fheadair cos léi cad a dhéanfaidh lámh léi = Her feet don't know what her hands are going to do.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

Ní fheadar (pronounced like N' fheadar) would have been traditionally always said instead of Níl ' fhios agam. But Lon Dubh is definitly right, you would never say Is feadar in the positive sense. Nil ' fhios agam is being said a lot now due to the influence of the caighdeán oifigiúil- the caighdeán plays a big part in Gaeltacht schools also- Students can't spell words as they pronounce them either, for instance dearúd/ must be spelled like dearmad and Gaoluinn must be spelled like Gaeilge, greannúr must be spelled like greannmhar- For instance I never heard of the word dearmad 'till I went to a Gaeltacht school. The school I was in always spelled and said dearúd and inniuimh/ inniuibh instead of inniu.

But you can oddly say Do dh' fhéadfainn é a dhéana(mh)- I could do it- Is used instead of Is féidir liom a lot in proper Munster Irish.

And ní bhféadfainn then is the negative.

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Go raibh maith agat! I always wondered was there some slight difference between Níl 'fhios agam and Ní fheadar, but it is simple that Ní fheadar is the original Munster usage and
Níl 'fhios agam is influence from the Caighdeán, there is no difference in meaning. (Or is there?)

I actually forgot the other dialects use "Is féidir liom" instead of "féad" as a verb.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

Firstly, I don't actually know where feadar comes from or what it means by itself so I don't know if there's a difference. The main thing to remember I suppose is that N' fheadar is used in Munster for Níl ' fhios agam, I don't know why but like yourself I have always wondered- to the point were its annoying me that I can't find out I used to think, as do a lot of others (perhaps out of ignorance), that feadar and féadar had something to do with each other, maybe its because they both look so bloody similar .

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I don't think they are related. Btw I think the latter is "féadtar" (one can/may).

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Agus is í Gaeilg Ġaoṫ Doḃair is binne