Hello Stapler, I know how you feel I got frustrated with very same issue months and left it in the too hard basket. worked it out today with the help of your posts.
Make sure printer is turned ON first and WiFi is lit up on front face.
GOTO print fax button in System preferences.
in print screen you will see a printer list on Left hand side of printers you already use including status of each.
AT The BOTTOM LEFT of this square you will see a + - button
Press the + button
This will open another window labled ADD Printer, with Default, fax, IP and Windows across the top.
In the Default page you will see another list of printer choice options, ( printers available to you )
press - select - the canon MG 5250 series_46698D000000 (your numbers may be different) and you will also see under the Kind heading on Right hand side it will say "canonijnetwork" ( This is what gave it away to me )
Then press ADD
Then go to document and press print, Command P
and in Printer selection, press up down arrow and your new priner should be in there.
selct it and Press Print, then Wollah, your document should be printing and it should show up in the print queue.
So the secret is that you will actually have TWO MG5250 printers in your printer option list. A ISB version and a WiFi version with long number beside it.
I hope this helps.
Keep up the good work everyone who contributes GREAT Answers to this Forum, I have learnt lots from it. Thanks Team MAC.
Cheers from Jason
Can anyone tell me how to add screen shots into these comment screens please, is it easy??