You need to use Access security. You will have to create a custom workgroup [file] with User Groups, passwords and assign permissions for each group for each db object. It is quite a challenge learning how to correctly secure an Access database. Search the forum for the keywords "security" "system.mdw" [skip the quotes] and read the thousands of threads on the subject. Good luck!
*Ensure that you make a backup copy of your db before you perform any security until you know what you are doing. I suggest backing your db with each new step you attempt for you can easily lock yourself out of your db!