Oh I see. Well the thing seems to be you have to give the link a name for it to show, you can't just post the "naked" url. So what you do is you first write the name for your link, highlight (choose) the title you've written and
then you paste the url into the field which appears when you click the add-link-button (the chain icon). Don't forget to first remove the little h tt p:// that's already there.
Should your add-link-button actually be out of use you can write the code yourself, it's the same string that AnswerBank uses for giving your links here a name and you'll find it in the
Tutorial (see what I just did there;-)
On AB you can post a link without naming it first:
http://www.theanswerbank.co.uk/ABTutorial.html
...but that doesn't seem to be possible in Blogger.
Good luck!