With the any coupon, you should follow these instructions.
- Go to www.tubebuddy.com and log into your account.
- Click on My Account
- Is the channel you want to upgrade listed under YouTube? If not, click on Add Channel to add the channel to the list.
- Click on the Upgrade License next to the channel
- On the order page, enter whatever coupon code you have in the Coupon Code area AND click the Apply button