How does one insert an image in their signature line?

[Make7]

5. It looks like you hit the 400 character limit...

... and some things aren't quite displaying correctly.

Try this:

[div style="margin-left:2em; color:#000099;"][p class=post-sig style='color:#002400; border: 4px double #002400; text-align:center;'][br /]Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize that we can't eat money. ~Cree Indian Proverb| No justice. No peace. | She frowned on homophobia. - Dr. Joseph Lowery at Coretta Scott King's funeral.[br /][br /][/p]
That should still give you enough available characters to play with the font-size if you want to.