To edit the profile select- 'My Profile' at the top of the seller menu. In the next screen, edit the details and select 'Save Changes'.
To change the password- select 'Change Pass' at the top of the seller menu. In the following screen, enter the old password in the 'Old Password' field. Then, enter the new password in the 'Password' field and confirm it by retyping it in the 'Confirm Password' field.
Both of the passwords should match. Then, the old password will update itself to then new one.
The seller can create his/her portfolio. The portfolio will contain descriptions of the samples with photos included. To edit/create a portfolio select the 'My Portfolio' link on top of the seller menu. Then, select 'Save Changes' in the following screen.