Yeh so hold down on space and drag the cursor below the quote - should work?Yes, iPhone. If the curser for whatever reason ends up in the quote, I can't fathom out how to get it out if there's no line below to move into. Pressing return just puts new lines in the quote.
Also I find sometimes you have to give it a few seconds before you start typing, otherwise the cursor is at the top of the text box (have seen this on other forums using Xenforo too)