In the full reply screen click the box on the upper left (with globe in it)
After you do that you'll get a field to add your link:
Then there is a second page where you can "re-write" the hyperlink so that it says what you want it to say, like so:
Here's my CAF stuff...
Same link - different view.
Do all that for your links & then I believe you can cut & paste them from that message into your signature edit. You can see the difference in how it looks by simply quoting this message (which is where you'd quote from for your sig)
See the different coding that gets added by the URL/hyperlink re-write..