Click Upgrade at the top of the admin panel, then click Change Plan, choose Professional or Premium and click Upgrade Now.
For Professional
This will ask you to approve the monthly subscription that can be cancelled anytime.
For Premium
This will open up a window where you set a monthly spending cap with Shopify. It will be pre-populated with a recommended amount; you can change this if you prefer.
Please note you will NOT be charged this amount. This is a spending cap only.
We will only charge on sales that Nibble converts.
Now, click continue. This will take you to a Shopify page to approve the cap.
Note
You can switch between all plans as you like from this page.