No, thats a rubbish way.
If u have windows 8 like me then your awesome and i can help.
go to the bottom left and click on the green thing that pops up when u hover over it. type %appdata% and hit enter. go on .minecraft then screenshots to view your screenshots. to add them click the attach file button that i think pops up on the bottom right of ur text box. it opens up ur documents. drag the images you want into a folder in ur documents.then double click the image the attach it. when its attached click the reply button and ur done!