As far as I am aware you cannot separate forms/applications created in MS Access from the Access application itself. In other words each user of your database must have MS Access loaded onto their computer. You can make your application less changeable by converting it into an ".MDE" file (executible database) rather than a ".MDB" file (standard Access Database).You can convert a database to an ".mde" file by pointing to Database Utilities on the Tools menu and clicking "Make MDE File".
Another issue that arises in a multiple user situation (presumably using a local network), is where is the database to be held. MS Access is not the ideal database environment for multiple users. You will need to know how to set up a central server database (eg. SQL Server) to which Access or other front end interfaces can connect.
Hope this is helpful!