Some of TP-Link wireless router’s USB ports support Print Server function. If you want to use this function, you need install the Utility your computer. Now, it supports Windows XP/Vista/7/8 and MAC OS. Please refer to the FAQ-415.
Make sure that printer works fine when it is connected directly to the computer.
Make sure the firmware the router use and utility running is the newest.
Follow the Guide FAQ-415, make sure all your settings is correct.
If still can’t print, please disable the firewall and anti-virus software to try again. If you can print in this way, please keep the firewall and anti-virus software disabled and reinstall the utility.