You cannot toggle on BOTH call forwarding and do not call.
You need to choose one or the other.
The written walkthrough follows the video.
This setup is done on your Numbers page.
Users: Settings / User Settings / My Numbers | Admins: Settings / Admin Settings / Numbers |
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No matter which page you are on, the process is the same.
Step 1
Hover around the right hand side of the number line you wish to work with until the Edit appears and click on it (turquoise arrow in image above).
 | Step 2 The number detail box will pop up.
REMEMBER: You cannot toggle on Do Not Call if you have toggled on Call Forwarding. |
 | When you toggle the button on, several more toggle buttons appear.
Do Not Call Message: This is the optional message your caller will receive. You also see a preview of the current do not call message.
NOTE: This message will be read by ROBO voice, and then the call will be disconnected.
[Toggle this button off if you do not want your caller to receive any message.]
You can also send this message as text. To do so, toggle on Send as Text as well.
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 | Step 3: Edit Do Not Call Message To change the do not call message, click on the 3-dot action menu and then click on Edit Message. |
 | Step 4 The edit box will pop up. Type in your new message. Then click Save to confirm your action.
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 | If you have edited the do not call message, you will see your new message in the preview (gold box in image to the left).
Step 5 If you wish to send this message as a text also, toggle this button on. |
 | And that's it! |