With the any coupon, you should follow these instructions.

  1. Log into your account at https://tubebuddy.com/account. 
  2. Is the channel you want to upgrade listed under YouTube? If not, click on Add Channel to add the channel to the list.
  3. Click on the 'Upgrade Now' button next to the channel
  4. On the order page, enter whatever coupon code you have in the Coupon Code area AND click the Apply button