Add a trusted device

Hi DarrenM - I'm hoping you can assist.  When we access the 'MAC filtering' tab, the copy on the right reads, 'you can use the MAC Filtering page to block specific PCs based on their MAC address from access to the internet on selected days and times.'  Can you plesae clarify how we can use this section add a trusted devise?  We tried the 'trust all' setting under the 'Wireless Devices' tab and we are still having issues with computers / phones connecting.  Thanks!