(quoted from post at 00:25:48 01/27/16) As JMOR said, you need the url tags.
They would look like this when you put them in.
Whether you click the button or type them. (faster for me to type them)
[code:1:37d25427af][url]http://dallas.craigslist.org/sdf/grd/5377600026.html[/url][/code:1:37d25427af]
Which will show up like this:
http://dallas.craigslist.org/sdf/grd/5377600026.html
If you want to get "fancy" you can add an equals sign, move the first closing bracket and a label like this:
[code:1:37d25427af][url=http://dallas.craigslist.org/sdf/grd/5377600026.html]Ford 2000[/url][/code:1:37d25427af]
Which would show up like this:
Ford 2000
Sometimes the links are really long so I use this method to make them shorter.
Classic view has boxes for you to put the url and label in separate,
but since I see you using the quote feature I'm assuming you're using modern view.