@Richard Been meaning to flag this bug for a while. Surprised others haven't mentioned it. On iOS devices its impossible to select text in the post editor. If you grab the opening book-end to try to slide it, it immediately reverts to being 1 character before the closing book-end. If you try to grab the closing book-end, it does one of two things; either it automatically puts the closing book-end at the bottom of the post, thus forcing you to select the entire post, or it highlights the entire post for a second and then the selection book-ends disappear entirely. It happens on other XENFORO forums too. You should report it to them. Clearly an issue with their software.