You need SharePoint Administrator permissions for this step.
Installation Guide
You need to deploy the package that was generated to the App Catalog.
1. Go to the App Catalog.
2. Upload or drag and drop the .sppkg to the App Catalog.
3. This will deploy the client-side solution package. Since this is a full trust client-side solution, SharePoint will display a dialog and ask you to trust the client-side solution to deploy.