General text markup
In general you can use the toolbar above the text box as it contains most tools you'd need to format a message.
If you want more control you can directly input the BBCode markup
(The link brings you to a Wikipedia page explaining how most of this works)
the TL;DR is
Code: Select all
[b]Bold[/b]
[i]Italic[/i]
[u]Underlined[/u]
[size=3]Slightly bigger text[/size]
[size=7]Significantly bigger text[/size]
[url=https://example.com]link[/url]
[img]https://example.com/link/to/image.png[/img]
Quoting
To quote a message for reply you can press the "Quote" button next to the message you want to reply to. This will insert a quote block that links back to the message. If you only want to reply to part of the message you can delete the parts of the message you don't want.
You can also add a freeform quote block with the quote BBCode tag.
PS: I'll add more if pepple ask about stuff or something else comes to mind.