Having difficulty setting configuration for Brother HL2270DW Printer 'Envelopes'.

[Shabakthanai]

Kubuntu 17.04
Brother HL2270DW Printer

When I feed the envelope into the printer, the printer feeds the envelope vertically and then prints horizontally on the envelope.

I have been unable to find an option to rotate the page that functions or the configuration option that sets up the printer to print envelopes.

I have read the manual till my eyes are going blurry, a couple of hours at least, looking for options to instruct.

Thanks! Shab