Updating the Default Sender ID
The default sender ID is the identifier from which your messages will be sent. This can be either a random shared number, a specific dedicated number, or business name.
To update the default sender ID, go to Account and then Account Settings, and scroll down to Default Sender ID. Then click on the pen icon:
Next, just select the preferred option from the drop-down list and click Save:
From now on, unless you manually change it at the start of the new message creation process, all your messages will be sent from this Sender ID. You can repeat this process to change the default Sender ID at any time.