Linked my Gmail account but now I'm stuck

[xcvtop]

Hi I have a live account upgraded it to a outlook account (kept it as live.co.uk as I do not want to reset my phone atm) everything is fine I get all my emails no problem but I have 1 question, how do I choose send from gmail in windows-phone? I can do it on-line on my pc and it sends it as if the email was sent from my googlemail but how do i do it from my Lumia 920.

thanks in advance