Select your Profile (name) in the vertical menu on the bottom left of the screen.
Select Edit Profile in the upper-right corner.
Items to edit:
Profile picture
Phone number
Name
Title
Select Update.
Note: To Grant Signing Authority, you would need to do this from the Admin settings under Users.
You can only edit your email address if you are a Firm Admin, which can be done through the Admin settings, where you can edit Users.