GNU/Linux CentOS Realtek rtl8192cu Driver Installation Guide
Hi! The linked Tutorial Shows You Step-by-Step How to Install Realtek rtl8192cu Wireless Driver in CentOS GNU/Linux.
And the Realtek rtl8192cu CentOS Driver Installation is Quick & Easy, involving at most the execution of some Basic Shell Commands.
Finally, if you have Different Card then See this Other Guide: How to Install Realtek Wifi Drivers on CentOS.