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All the internal users (with a Salesforce License) which will be creating Forms through the builder, completing generated forms or in general will distribute forms out will need to have some basic permissions for the app to work correctly. At the point of installing the app, you will be asked what user level permission you want to grand to the app. If you select “All Users”, then you do not need to take any action. If you selected “Specific Users” then you have assigned full access to the app only to specific users. Please refer to salesforce documentation on how to grant user access to applications.