If you would like to have your image right in the message...
Go to your image in your gallery (the first web link in the above message).
The click on the "Options" button and select the "Share Links" from the drop down menu.
Then COPY the "Image Link" (the third one down in the selection box).
Go back to your message, place your insertion cursor where you want the image to appear, then click on the "Image" button (the 11th button from the left side in the EDIT header, looks like a computer screen with a photo, when you point at it with your cursor it says "Image"), and then do a PASTE into the URL dialog box, click OK, and viola, your image appears just like below...
Takes longer for me to describe and for you to read than it actually takes to do it. And, the more often you do it, the quicker and easier it gets... So, do it a lot... everyone likes photos!