signature pics

[marca]

hi, i have a very newbie question to ask... erm, how do you insert those pics for your signature... i tried to copy and paste the pic, but failed... i also clicked on the insert image but they only display a url but not the pic itself...

i have given up on trying to figure this out by myself, so i'm asking for help... would appreciate it if someone can take the time to teach this newbie how to do it... thanks in advance...