Technically you can't, but I sort of did and here's how: accumulate some money, post a player for more than it is going for...for example, say you have 75000 on 1 account and 30000 on the other, and you want to transfer to the one with 75000, post your player on auction for 75000, unless it's worth more, and post it for 72 hours. Get on your other account, scroll to the end to find your player and buy it. You can do that many ways, that's the only way I can think of, I did it like that with a team i had