I'll just reply quickly for now.
Use the standard reply box and not the quick reply option (if you have it enabled).
Once it's open, you will see various square icons that show different options. Click one that you think you would like and it'll paste into the reply box a pair of BBCode commands. You need to type any text you like within those boxes.
eg.
[ b][ /b] those are the commands for Bold(no spaces), so if you type between those two commands, like this (exc. spaces).....
[ b]This is Bold[ /b] you will get the following displayed when you post...
This is Bold Basically you need to enclose your text within the command brackets, so if it begins with
it must end with noting that
/ closes the command.
In time we'll get more detailed instructions up, unless someone is prepared to volunteer
Have a tinker with it, and use the Preview button to test your settings before you post.
HTH