I was playing evil and had just been to the graveyard and got the nether scrolls. When Edwin wanted to look at it and try to translate some, he turned into a woman.

Now I`m in Underdark and nothing more has happend to him\her. The rest of my party just makes fun of him\her, anyone has got an idea about what I should do?

Just relax! It takes some time before he, err she turnes into a man again. So just sit back and enjoy the dialog when constantly they pick on her (him). Probably the most funniest part in the game!

Grr, why didn't he read the scroll in my game?

Yeah why not?
i would really wanna see a female edwin

It just takes him a long time. Character plots also don't happen in chapters four, five or seven so the time then doesn't count either. I think it's a timer based on real time so just leave the game running for a while to get the result. Entering an area while trigger it so after the timer has expired so move around a bit.I just hung around in chapter three till he'd been cured. For a laugh talk to the guy in the copper coronet who chats up all the women when Edwin is female. Just save your game first.
Understatement of the game "This is bad" (just after Edwin has changed himself).