Fill out signup-form with email data


before I send my new members to to register, I let the optin through infusionsoft to have a double optin and a working email adress.
After this I send them to to fill out the form and register their website/subdomain.

I send them trough an infusionsoft-link like this, with the email adress as an attribute:

My question: Is there a way to enter this email adress on the signup-form in the moment the user sees it and possible grey it out so he can't change it?