There are different ways to access Submitted Forms in the Management Portal:
Forms>Submitted Forms
Home > Forms > Submitted Form
To see forms connected to a client in the CRM > Management Portal > Contacts > Select client > Activity > Foms.
In the App, Forms> +Submitted Tab
Customer submitted tabs are avialble in the Management Portal and the App based on Group visiblity when creating the tab/s.
Submitted Form Tutorial