You need a prestige token, then have a party in the lobby and have ur friend be the host
Go to unlock gear and click a perk to unlock and when it says Yes or No to buy the perk make your friend find a lobby and when its searching make him back out.
It should say yes or no but you won't be able to click one, go to baracks and buy double xp and then its gonna be ale to let you click the yes or no icon. Click Yes and you should have anothr prestige token.
Keep doing it as much tmes but make sure all you need is one prestige token.