Two ways: You can access the budget on M7-14 or you can post an award on M6-19. When you access them, if you get the following two messages, you will know that you do not have access. You will need to submit budget access form. See question above.
Scenario 1: M7-14: If you do not have access you will get the message, "YOUR USER-ID DOES NOT GIVE YOU ACCESS TO THE REQUESTED FUND"
Scenario 2: M6-19: If you do not have access you will get the message, "YOUR USER ID DOES NOT HAVE UPDATE ACCESS TO THIS FUND"