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Navigate to DSS keys: Using the arrow keys, navigate to "Features" and then select "DSS Keys".
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Select a line key: Choose the specific DSS key (also known as a line key) you want to program and press "Enter". Note: The first line key is reserved and might not available for customization.
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Choose the key type: Select the desired function from the "Type" field (e.g., Speed Dial, BLF, etc.) using the arrow keys or softkeys.
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Enter the label: Enter a name for the key in the "Label" field using the keypad.
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Enter the value: Depending on the key type, enter the corresponding value (e.g., extension number, phone number) in the "Value" field.
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Save the changes: Press the "Save" softkey to apply the changes.
Yealink Sidecar:

Press and hold the unassigned button on the sidecar for about 5 seconds.
The host phone's main screen will open the user setting interface for that specific extension key.
Use the phone's navigation arrows to select the Type (e.g., BLF for tracking internal extensions, or Speed Dial for external numbers).
Fill in the required parameters:
- Label: The name you want displayed next to the button.
- Value: The target phone number or internal extension.
- Line/Account ID: Leave this as
Line 1 (default) unless managing multiple accounts.
Press the Save or Confirm soft key on the phone.