Clarify the use of the term "allocate seat", as it's not clear a seat can be unpaid. :-)

Hi, I had a human-error issue where I had two users in my user list that I couldn't figure out how to give them view access.  I clicked the viewer access button, but nothing would happen.  It turns out it was because I wasn't clicking "allocate seat".  I didn't want to hit that button because I assumed allocating a seat meant "allocate PAID seat."  Human error, I admit, but something to think about.