You probably can't mate. The kit is an official one and can't be edited so you'll have to use an option file.
Unless someone has made one (not to my knowledge) then you might be stuck mate.
I did this with Chelsea on PES5 so I could use the new kit: Start a Master Leauge and choose create new team. Then create your kits as you wish (Arsenal obviously - like your pic). It means you can assign them the Arsenal badge too and make their home ground Highbury plus change the sqaud for the Arsenal players. Home this helps. Dont be afraid to ask if it doesn't.