Arranging : Time, Tempo, Meter, Key, and Chords : Key Signatures : Changing Key Signatures

Changing Key Signatures
You can add, edit, or delete key signatures.
To add a key signature:
1 Place the cursor in the Timeline where you want to add a key signature.
2 Do one of the following:
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– or – 
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3 In the Key Change dialog, select the mode (major or minor), the key, its location and range, and how you want it to affect pitched tracks.
4 Click OK.
To edit a key signature:
1 Double-click the Key Signature marker in the Key Signature ruler.
2 Make changes in the Key Change dialog.
3 Click OK.
To delete a key signature, do one of the following:
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Alt-click (Windows) or Option-click (Mac) the Key Signature marker in the Key Signature ruler.
– or – 
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Make a selection in the Key Signature ruler that includes the key signature you want to delete and choose Edit > Clear or press Delete.