From the last part of my link, above:
" . . . You should then see your picture displayed on the TinyPic website, with a set of links to the left of it.
Click on the bottom link, to highlight it. Then right-click on it and select 'Copy'.
Come to an Answerbank post and right-click where you want your link to appear in it, selecting 'Paste'. (IMPORTANT: Make sure that there's a SPACE both before and after your link, otherwise it won't work properly). "
So where does that go wrong?