To add a signature to your profile, go to My Profile, Edit Profile, and there is a signature box. When you use the quick reply box, your signature is automatically used. The post button gives you a choice whether or not to apply your signature.
Mcode is like html, but a little different. You can forget about
it, and use the bold, italic, and other buttons in the editor, they use mcode behind the scenes for you.
Instead of less than and greater signs of html tags <b>, square brackets [] are used in mcode.
Here's a guide to mcode:
www.healingwell.com/community/mCode.aspx