Lol stop scamming him...
Print, the main way to sell gold is through a minnigame called bounty hunter. You take in armour at the value that the other person wants to buy, for example, if they want to buy 2m you take in a sara plate. (f2p bh)
Then you let them kill you, they get the plate and sell it at the g.e for 2m.
Normal prices are around $3-$5 per mil.
The max trade you can do at one time is around 5mil, so it's going to take you 20 trades to sell it all.