Re: [Resolved] removing ”create an account” link
Here are a few options I thought of off the top of my head:
1) You might consider using a “membership” plugin. I don’t have a lot of experience with them myself, but I think one of the features of some is the ability to use a “key” to register (think of it as a password). You could give them the “key” at the end of your survey.
2) If you are savvy with code, you can likely pass a query string via the url bar as well if your survey software allows it.
3) Password-protect the BuddyPress registration page. You should be able to do this via the WordPress page editor. You could give all the participants the password.