You're not the only one confused--it's something I'll be working on as part of a site redesign.
Currently, the only way to access the main survey is by clicking on a link in an email I send out. The next one of these goes out tomorrow. The link is encoded, so it takes you straight to the survey with no need to log in. I thought this would be simplest.
But many people wander around the site looking for the survey to fill out. There are other surveys on the site, but not the main one. So they figure they're just not looking in the right place, when there's simply no way to get to it by going to the site.
Currently, the only way to access the main survey is by clicking on a link in an email I send out. The next one of these goes out tomorrow. The link is encoded, so it takes you straight to the survey with no need to log in. I thought this would be simplest.
But many people wander around the site looking for the survey to fill out. There are other surveys on the site, but not the main one. So they figure they're just not looking in the right place, when there's simply no way to get to it by going to the site.