Rather than use the pop-up dialogue box, I just cut and paste the address and write the rest in, in this format:
[.u.r.l.=(Cut and paste site address)]Write in title of link that will appear in thread[/.u.r.l]
Don't use the "( )" brackets around the address. or the "..." in url. That was just to get it to show in the thread!
It will then look like this:
Write in title of link that will appear in thread