1) Place the Backend (the one with ONLY the tables) on a shared network resource. Make CERTAIN that all users have at least Modify permissions on that folder (Full permissions is better, IMO).
2) Provide EACH workstation with a copy of the Frontend (the copy with the forms, report, etc in it). That means you do NOT share this file - give each user a copy of it.
Each user would then run their own copy of the FE, and they would all be connected to the BE (you may need to include relinking code to provide a method for your users to relink).