MSP - Self Service Portal Customization

MSP - Self Service Portal Customization

Hi all, someone can help me to understand how I can customize the Main portal where the requester click on "Submit your request" button?
For example, I want to modify the logo of the button. The only thing that I'm able to do resize/add/remove widget area.
I tried some month ago the demo version of SDP and If I remember well was possible to directly edit the html code.
Thank you so much.

                New to ADSelfService Plus?