Look here if you have bought revoked gifts:

1. Accounts listed above includes the owner of this account and one of his alt. trading account.
2. If you have bought revoked gifts, contacting the seller via these accounts for resolution is more effective than contacting Dispenser.tf.
3. If needed, these are the accounts to be reported to Steam support.

1. Select the game that you want to buy.
2. Make sure you have the exact amount of items to buy the game (If you are using the dispenser.tf bot for the first time, you need to provide your trade offer URL so that the bot can send you a trade offer - you can find you trade offer url here: http://steamcommunity.com/my/tradeoffers/privacy
3. Click Proceed