Form permissions are how you can control which eCRFs (forms) each user role has rights to view and/or edit. 

After selecting an existing role, the form permissions can be viewed and edited from here:

This will open a list of all the forms that have been created in the Form Manager.

For each form listed, individually allow the role being edited to view forms or edit forms.

Note, if the role does not have the permission to edit forms in the system permissions, it will not matter if insert/update is enabled in the form permissions. The same is true for viewing rights.