|Wireless may be turned off on the router, although that would be unusual as it's turned on by default on every router I've dealt with.|
To enable/disable wireless on the router:
Use a PC which is connected by wire (ethernet) to the router.
Open a web browser and in the address-bar type
A window will pop up and ask for username and password. By default, they are both admin.
After Login, you will see TP-LINK Management Page. Please go to Wireless section.