lighttpd forum XCache > Newbie needs some help

I'm on a shared hosting plan with NameCheap. I'm running vBulletin on my 
site, and I was told I should get my host to install XCache, as it would 
improve the performance of vBulletin.

So, I contacted NameCheap, and they informed me:

"Unfortunately, global php will not be rebuilded. But you have an 
ability to use so modules and Zend is installed.
You can try to place so module for your software and add it into local 
php.ini as Zend extension."

And after going back and forth with them a few times, they placed a 
compiled xcache.so in my "/public_html" directory, along with the 
attached php.ini file. Anyway it doesn't show up in vBulletin's Admin 
Control Panel "View PHP info" section, and I was hoping someone here 
could help me get this working.

Thanks,
 ~ Austin