Ok, i take screenshots like everyone else... how do i take them from the folder and POST them on forums? PLEASE HELP

I have a Mac and a laptop btw...
~Sahara

Name: Sahara
Gender: Female/Doe
Age: Young Adult
Lives: Anywhere
Likes to: Explore and meet new deer.
Family: Looking for a new one.
Personality: Funny, quick, swift, and a flirt at times.
Pictogram: http://tale-of-tales.com/TheEndlessForest/register/pictogram.php?usernam...
Pic: WIP