At Settings → SatisPress → Settings, you'll find the settings page:
When requiring a package from SatisPress, the default would be a package name like satispress/genesis.
The Vendor field allows this to be changed; a value of mypremiumcode would mean the require package name would be mypremiumcode/genesis.
Once you've started using a vendor name in your projects' composer.json manifests, it's a good idea to leave this setting alone. Otherwise you'll need to update every reference to the old vendor name and you may not be able to install dependencies if you need to check out an older version of a project.