Put oil in the cooling tank by mistake [yeah, i know]. The bike is a 50cc Gilera DNA if that makes a difference..
Is there any [easy] way to do this or do i just take it into the shop?
I have a Harley so I couldn't tell but start here and I think you can find a discussion group that should be able to help you
http://www.bikez.com/motorcycles/gilera_dna_50_2005.php