I am really new at this. katiemac answered the post and her comments appeared in blue print following the words she edited. Do you mean like this? Does this occur when you write behind the words of the quote, or is there a tool that does this? It's a couple of tools, actually.
Look at the reply window. At the top you'll see a couple of lines of icons. Top row, from left to right:
A couple of letters with a red X through them: Remove text formatting.
"Fonts" drop-down box. Highlight some text, then change the font in that section,
like this.
Next drop-down box, "Sizes." You can change the
size of your writing here.
Next, a Capital-A with a thick line under it. That's the tool for changing font color.
Like th
is.
After that you get to smilies:
Attachments. Undo and Redo. Increase and decrease size of the editing window.
And Switch Editor Modes.
And that's the top row of tools available in the Reply box.
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ETA: If you're using the Quick Reply box, you get the selection of icons mentioned here by using the
Go Advanced button.