First, log in to your Indystack admin panel.

Go to the Manage section and choose Add-ons.

You'll be presented with a list of add-ons available to you and the number of licenses that are also available.

Simply click the Add to plan button to have that add-on available.

You will receive a notification when it is successfully added to your account.

Any add-on that was added to the plan can now be accessed as an option to include with any new site that is launched. When you get to the 3rd phase of the launching a new site steps, you'll see your add-ons listed there. Any that are added to the site during launch will be installed automatically during your site setup.