trying to get to the engineering menu

This may be a dumb question, but how and where do I enter these codes? If I press the * key, the box appears but what next? How exactly do I enter 3 pauses?
Thanks.
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Code to lock keys. Press together *7
Note: [] (pause) means the * key held in until box appears.

Select phone line - (use this to write things below the provider name):
[] [] [] 0 0 8 [] 1 []
Add phonebook to main menu:
[] [] [] 1 0 5 [] 1 []
Add messages to main menu:
[] [] [] 1 0 7 [] 1 []
Copy SIM memory (phonebook menu):
[] [] [] 1 0 8 [] 1 []
Eng Field options (main menu):
[] [] [] 1 1 3 [] 1 []