You cant I dont believe. Guiminer hasnt really been updated over the last year, and it only supports CPU and GPU mining, so thats why it doesnt recognize your Jalapeno.
You are going to need to use cgminer or bfgminer. Its not hard to learn, just takes 5 minutes, and googling. In fact, I will even help you (im in the kind of mood today).
1) Download bfgminer for Windows from here
https://bitcointalk.org/index.php?topic=168174.0 (get the right version and download the zip file)
2) Extract folder to your desktop
3) Open the folder, right click bfgminer.exe and make a shortcut, take that shortcut and paste it on your desktop
4) Right click that shortcut and choose properties.
5) On the "target" line, remove the quotes around the bfgminer location (should be something like C:\users\[user name]\desktop\bfgminer\bfgminer.exe)
6) On that "target" line make a space after bfgminer.exe and add the following "-o [url of pool server] -u [worker name] -p [password for worker] -S All -G", without the quotes of course.
7) Hit apply, then hit ok.
Now double click the shortcut, and away you go, you should be mining.
