Trying to post a picture!!!

This is Rio Rottie x Black lab
Showing her ickle little puppy belly belive it or not she only 9 months in this pic!!!

ok so it didnt work again!!!!!
it said that i have tried to upload an invaild picture type!
it says it only excepts things like with loads of letters and stuff please help!!!!

Phred's tutorial will help. :)