Well, first you touch the words image on the post a reply bar. it should look like this:
Then you get an image: http://i1317.photobucket.com/albums/t635/iampenguindsc/Hippie_zps0b59c861.png


Then you put your image in side the , and in the end it should look like this:



But in your signature the bar will not be there, so type it in yourself like this: , simply put the image inside, and this is what you have:

HOPE THIS HELPED!