How to upgrade with partner authorization code

This tutorial goes through the steps to upgrade to Pro plan with a partner authorization code. You can get the authorization code when you purchase certain partner products.

Once logged in to Dronesitter, open the side menu, and click on the "Account" link at the bottom.
Entry link for Dronesitter account page.
On the account page, input authorization code and click on the "Use Authorization Code" button.
Input authorization code on the Dronesitter account page.
If the code is valid and hasn't been used before, you should see a success message and your plan being changed to Pro.
Upgraded to Dronesitter Pro plan.

Note that once you upgrade with authorization code, you won't be able to upgrade to Ultimate plan, or downgrade to a free plan. Which probably won't matter for majority of the users.