All Text Campaigns can be edited from the campaign Edit screen for that particular campaign in Retention Pro.
You can make edits to the wording on any of your text campaigns in Retention Pro from the Campaign Edit screen which can be accessed by following these steps;
To change the name on your outgoing campaigns you would change the Company Contact Name in your Company Settings. See How Do You Change The Name On Campaigns? for more information on changing the name.
First, click on Campaigns at the top of your screen.

Finally, click on Edit next to the Campaign you would like to change.

This will bring you to the Campaign Edit screen.
From here you can change the text in the Message entry box at the top center-right of the Edit page.

It is important not to edit anything that is in brackets since these are Variables for the campaign that auto-fill certain information. For example: If you see [Company.Name] that is where the campaign fills in your shop name. To learn more about Variables please see Text Campaign Variables
Also see How Do I Send Out A Slow Day Blast?