Write the uppercase letters seen in dfsGHFuyt: this is the one that kept rejecting me..
Something else must be wrong then, because it clearly says.
"Verification Questions
If you want users to answer verification questions in order to stop spam bots you should setup a number of questions in the table below. You should pick relatively simple questions; answers are not case sensitive. You may use BBC in the questions for formatting, to remove a question simply delete the contents of that line. "
To me that says, anything that is not case-sensitive means that any uppercase or lowercase character can be entered.