First, I will move this to the Feedback/Questions board, because that's what it is there for .
Now, both of those can be done by going to your User CP, you'll see the link for it on the left along with the Info, New Posts, Search and Chat links. From there you can edit your profile to include gender and location and such. However, you can't change your title until you've been here for I believe four months.
To change your signature just go to edit signature in the User CP, but make sure you don't exceed the limits as laid out in the rules.