Kind of solved this now - thanks for replies. I managed to set up a link by copying part of the HTML only and got the image as well as text. Hard to explain but it worked and I can click through now and Amazon comes up on the Associates page.
What do you mean Mr V that this is not what MN is for - do you mean you think my question is inappropriate? Or that MN isn't about making money?
If the former - sorry but we do all ask all sorts of questions on here and I didn't think there was anything wrong with this one.
P.s. Mr V - my website isn't primarily about revenue generation - it's not an e-commerce site so it's not a problem that it's in Moonfruit rather than something more complex iyswim. I just needed this one AAssoc link (long story).