When you push the "Insert Link" icon (globe with a chain link), be sure that, at the very beginning, the "http://" is not there twice.

Best way for me:
- it's best to have TE open AND the page you want to link
- go to the page you want to link
- right click on the address bar of the page you want to link
- go to your TE message page, hit the "Insert Link" icon and paste copied link
- before hitting "OK", arrow back to the beginning of the link's address and delete the duplicate "http://"

Your inserted link must begin with the "http://", but can't have it twice.

Hope that helps. It's hard to articulately describe each step precisely...would be much easier to show, but Perth is just too darn far