If you mean you want a direct link, but not show the address, you do it like this:
[ url=/forums/t/123324.aspx ]How to add links in a post[ /url ] only without spaces.
How to add links in a post
If you want a link to be a "hot" link and show the address you paste the address into the post and highlight it:
Then you click on the "Link" button in the editing menu above:
Then paste the URL address into the "Link URL" box cell and select "Insert":
You will now have a "hot" link as below:
/forums/t/123324.aspx