One of the confusing things about the new board is Members inability to see their own profile. As a result, people think they cannot edit their information.
When you select "My Profile" as a member it does not display the profile. That is because members cannot see profiles, even their own.
However, go to the next selection in the pull down list "My Settings" and click on the "Profile" tab and you can edit everything on your profile; signature, photo, etc. by selecting the menus on the left side of the screen below arrow #2.
Picture enclosed to show you where to go. Hope this helps.
Your friendly neighborhood Shadragon