Comment to New Plan
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First of all make sure that you've specified key&secret for your new site, you can generate it on una.io site in Account > Keys & Secrets, then you can insert it on new your site in Account > Studio > Setting > GENERAL.
After above is done you can install new modules from Account > Studio > Apps Market > Storefront and configure your site.
Here are some of docs which will help you to get started:
https://github.com/unaio/una/wiki/Add-Apps
https://github.com/unaio/una/wiki/System-Apps
https://github.com/unaio/una/wiki/Studio
And other docs in Configurations section