It is there in the code, you just have to work your way through it (and practice using Preview, if you want my advice–you can click on the link in the Previewed text and it ought to work. If it doesn’t, scroll back down to the Reply window and figure out what you did wrong).
It goes like this, but without the spaces:
[ URL = " http:whatever it is " ] Blue Words [ / URL ]
left bracket, URL, equals, quotation marks, then Copy and Paste the http address, then another quotation mark (very important), then a right bracket, then whatever words you want to be in blue, then a left bracket, then a right slash / and URL which means “end URL” the way [/hijack] means “end hijack”, then a final right bracket.
The main reason the links mess up is because you left out a bracket somewhere, or a set of quotation marks, or because you got a left bracket somewhere instead of a right bracket.
Always use Preview.