There are different ways to access Submitted Forms in the Web Portal:

Custom submitted tabs are available in the Web Portal and the App based on Group visibility when creating the tab/s. Tabs can only be created in the Web Portal 

Forms > Forms Dashboard > Submitted Forms

Forms>Submitted Forms

To see forms connected to a client in the CRM > Web Portal > Contacts > Select client > Activity > Forms.

In the App, Forms > +Submitted Tab