Thanks Speedy,
I was looking on Polo and is says: ´Deposit address: poloniexwallet´ So that is simply my username.
Thanks - Peter
When depositing into Poloniex, you MUST include the code in your memo field.
Deposit address: poloniexwallet
Memo: some alphanumeric string
If you don't include the memo, Poloniex will not credit your account.