For quoting, instead of replying to a post as usual, you click "quote" at the bottom of the post you want to quote from and it will come up like a normal reply but with the previous thread in quotes.
For lettering size/colour, look at the options above the box which you type a reply in and there are pull down menus for size, font and colour. If you select one of these, it will come up with another box where you type your text in.
HTH
Jx