Here you go
I am posting here with the BBCode disable (you check below the draft message to select this) so that I can describe it to you.
You open and close the color and size using the following, with the text in the middle. I find just remembering these and typing them to be easier than using the buttoms aboveon the draft. Would look something like this:
This is a test for Ron.
You must open the code, type your text, then close the code using the / in the brackets as shown above.
Best is to play with what you want, then hitting preview to see how it turns out. Made changes as needed, then submit when ready. I did this quite a few time suntil I got it right.