After creating a theme using the Branding Guide or one from scratch, you can edit it by clicking Edit Theme under Branding.
Select which theme you would like to edit and you will see the below window pop up. Edit the theme name, accent and text color, background image, color, and type.
We recommend using a high-resolution background image.
Click Save, Delete, or Create New Version when finished.
To use the edited theme, go back to Settings > Branding and click on the theme. You can choose standard themes or your own created themes.
The theme you choose will affect all send-outs that all users do on the entity.