To control access to new forms you will need to add them to a security task using the Security Task Setup window. You could create a new security task or add them to an existing security task. Refer to Adding security data for more information about adding security data for your integration.
By default, security in Microsoft Dynamics GP doesn’t allow access to a new form. Users assigned to the power user role will be able to access the original form, but not the modified or alternate versions of the form. The administrator for the Microsoft Dynamics GP installation will need to use the Alternate/Modified Forms and Reports window to specify access to a modified or alternate version of a form.
Refer to the system documentation for Microsoft Dynamics GP for details about using this window to control access to forms.