if you are using the basic editor you can use copy and paste then copy and paste into the box that pops up. If you are using advanced editor then you are going to have to ask someone else.
It's quite simple Mistman96, You only need to copy the image by using the left click of your mouse and simply use CTRL-V in the editor.
It's how I do my stuff.
See Here:
http://chooseyourstory.com/forums/newbie-central/message/7985