To customize the colors and fonts, you can go to Settings > Widget Design. There you will see a preview of precisely what your glow widget will look like to new customers.
You can also select a customer from the dropdown to see how the site looks for a logged-in user. This could also come in handy if you need to troubleshoot issues for a customer.
In addition to just previewing the widget, you can adjust the colors and fonts to match your site. Adjusting the font does require being on a paid plan.
Note: There is no save button, the changes are saved automatically.
You can edit the text of the glow widget by going to the translation section.
Please let us know if you have any questions.
The Glow Team