You need to right click on the tabs within the Fieldmaker Configuration window and make sure your FIMS user is listed there to have access.
Note: A FIMS system administrator needs to assign your user access. They should be the one checking and giving you access if necessary.
Also Note: spaces cannot be used in the access list. For example, if the access list is "user1,user2, user3" this is incorrect. user3 will not have access due to the incorrect space after the comma. The correct format is "username,username,..." (ex user1,user2,user3)