How Do You Add Pictures/signature Pictures?

How do you have a picture as your signature and how do you add pictures because i have a bunch of colleges i made and i want to put them up on the site! (:

Dear Mr. David Cook

Dear David Roland Cook,

how can i explain how badly i want to meet you. it was a blessing for me to actually get to see you live in concert 2 times. i wish you could play in CT more and would be the happiest girl in the world if i were to ever have a conversation with you. i remember when i started to fall for you, i turned on my tv and when i saw it was AI i said "ew i hate AI" (ever since Taylor Hicks won haha ). but then i heard a beautiful sound coming from the tv. i put down my remote... and looked closer at the tv. and there i saw you, singing livin on a prayer by bon jovi. it felt as if time had stopped. and as you came to the high note i felt my heart cheer. and i knew this wasn't just some guy who could sing. i knew right there and then that you would go all the way and make every girl feel the same way as i do. and so i voted every week for the same person. david cook. david cook. david cook. and when the finale came i was on the edge of my seat "bitting my nails". and when he said david cook i screamed in joy. i don't think anyone deserved to win but you. you have an amazing voice and know how to make everysong yours. i just want you to know that i'm behind you 100% of the way and just keep rocking. love you!

-Katie Headley