OsiAffiliate provides you complete custom solution to enable terms of services text for the signup page. There are following steps you can follow to Add Terms Text and then enable terms of services text for the sign up page.
1. From the Admin Dashboard, click "Setup"
2. Under "Settings", click the button "Manage Terms and Services Text"
3. At this Page you can type your Agreement Terms and Conditions and click "Update"
4. Go to "Settings", scroll down and click "View advanced settings" link and check the box saying "Require Terms and Services Acceptance"