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) Find thing you need from below
2) Click on them and choose variant of pay, by tf2, dota or csgo keys
3) Click Purchase on the bottom right