Whenever I try to post to the forum from my iPhone, it prompts me to set up my account. I was already logged in, but I tried inputting my username, email, and password anyways. It gave the error that the username was already selected.

I then tried logging out of my account in the app and logging back in and trying to post in the forum again, but it had the same problem.

I think it's something gone wrong with your new trial ability to study without an account.

I have experience the same problem and Nick's aware of it. Very much already looking forward to an update that has the sentences function in it :-)

I see what's going on now. We'll get this fixed for the next version. Thanks!

So can't post from app until next update?

Right. You can read the forum, but posting won't work until we can send out a new build.