How do I change group, label, status colours?

You can either use custom images for your badge example:

<img src="url/to/image.png" alt="Group Tag" width="200" height="auto">

or you can use Name html tag with Bootstrap's default badge classes to get simple colored group tag.

Bootstrap class that defines color looks like this badge-primary, you can change the color by changing the 2nd part of that class with one of the following Bootstrap's default colors. primary, secondary, success, danger, warning, info, light & dark.

If you wish to use custom color for your badge you can do that by using this

<span class="badge" style="color: #fff; background-color: #ff0000;">Example</span>

And replacing #ff0000 with the hex code of a color of your choice. You can get hex codes of a color by using this tool: https://www.google.com/search?q=color+picker