You might be looking for a simple way to add links or ordered/unordered lists in the custom message in your space settings. The simple way to do so is by using Markdown syntax.
Markdown is a lightweight markup language for creating formatted text using a plain-text editor.
You can copy the code for all sorts of examples by visiting https://markdown-it.github.io
As an example, to add a link, you can use the following:
[http://testimonial.to](http://testimonial.to)
Or, to add an ordered list, you can copy the following:
1. Lorem ipsum dolor sit amet
2. Consectetur adipiscing elit
3. Integer molestie lorem at massa
And if you'd like to add an unordered list, this should help ✌️
+ Create a list by starting a line with `+`, `-`, or `*`
+ Sub-lists are made by indenting 2 spaces:
- Marker character change forces new list start:
* Ac tristique libero volutpat at
+ Facilisis in pretium nisl aliquet
- Nulla volutpat aliquam velit
+ Very easy!