1. You will receive a voucher / coupon like this ( login:password ) : kvnn68xxx:dczkmnyyy
2. Login into the account you want to extend. ( If you haven't account at https://depositfiles.com/signup.php , you just need to sign up )
3. Open page https://depositfiles.com/gold/payment.php
4. Scroll screen and look up field "If you got (purchased) Gold-Key and want to activate it, put it here and click Activate:"
5. Put your Premium Key then click to "Active"
6. The account becomes Gold.