Add a menu entry of type Form. You can use this type to refer to:
A form in D365 F&SCM.
A (form-like) element in another type of application.
Steps
Click Business process modeling.
Click Applications.
In the list, click the link in the selected row.
Click Menus.
In the tree, select 'Client\Menu'.
Click Form.
In the Title field, type a value.
In the Action field, enter or select a value.
Click Save.
Close the page.