Gdybym wiedział, to bym wam powiedział.

I am a woman. How would I change this sentence?

I think it would be ‘‘Gdybym wiedziała, to bym Wam powiedziała’’.

And I think you could also say this sentence (as a woman) as ‘‘Gdy wiedziałabym, to Wam powiedziałabym’’. It basically means the same thing, with less emphasis on the conditional element of the sentence. The first sentence sounds stronger, along the lines of ‘‘IF I had known (about it), I WOULD have told you’’.

Here’s a link to a useful website with Polish verb conjugations. Tables of Conjugation of nearly 500 Polish Verbs