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My HP Printer was working fine on the wireless network, but now it can't connect

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My HP Printer was working fine on the wireless network, but now it can't connect

I have been using Comcast for well over a month now.  My HP Officejet Pro 8610 printer was working fine on the wireless network until yesterday.  It recognizes the network, but cannot connect to it.  The test resultss indicate I need to add teh MAC address of the printer to the list of permitted devices for the wireless router.  How do I do this?