Sorry for the delay.
You click on 'Profile' at the top of the page, that takes you to the 'Information' tab of your profile, on the top right is a tab called 'signature' click on that to add your signiture. The rules are no gambling or sex site adverts. Anything training (I notice you have a supplements page & that's fine). One think that would be good would be could you actually put which products are vegan on your site. This will help people who are vegan find stuff more easily (& also those who have issues with dairy, shellfish etc know what is safe to buy)
Glad to have you onboard.