1 Place the cursor in the Timeline where you want to add a key signature.
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Click the Plus (+) button in the Key Signature ruler.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.1 Double-click the Key Signature marker in the Key Signature ruler.
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Alt-click (Windows) or Option-click (Mac) the Key Signature marker in the Key Signature ruler.
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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.