Most teachers should plan on setting up sub accounts (log ins) for students. A student sub account prevents students from accessing teacher's guides, answer keys and community pages. They also offer more ways for a class of students to access the site. A single log in can cause problems with a large number of students because the log in will lock temporarily for five minutes after five incorrect attempts. Having additional sub accounts (log ins), will allow teachers to seamlessly switch to another log in, if one should lock. We strongly recommend setting up sub accounts! For more information, see this page, which contains a video of how to set up the log ins quickly: http://edheads.org/page/SubAccounts
We will be happy to help! I'll email you a couple of questions and then we will get right on that. However, if you or anyone else has suggestions on how to make the process more transparent, I would LOVE to hear them. We have tried several times to clarify, but we don't seem to be getting any closer to clarity!