Modify an Existing Script for my need.

this is a simple project. all i want you to modify this [login to view URL] . I want that user can singup on site and generate a code to use these widgets on there site... As this script is made for single site use... but i want to start a service based on this script where user can use these boxes on there website but they have to signup with my site.. i need a small (powered by MySite) link on bottom I will provide the design & purchased copy of script. Do watch DEMO video on [login to view URL] before bidding.