If the photos are in your computer, here's what I do
What I do First, change over to the modern view, this allows you to easily add captions to different photos. Then after you have entered what you want in the message box, go to the bottom of the page where it says ADVANCED POSTING TOOLS click on BROWSE which should bring up a box from your computer. On mine, I have to click on PICTURES on the left side of the page to open up a page with all the pictures on the computer. Then I select the picture I want to upload which enters the code for the picture in the lower left box. Then click on UPLOAD and the picture will appear in the little box on the right. THEN you have to click on CONTINUE or the picture will be lost. If you want to upload more pictures click BROWSE again. Then UPLOAD and don't forget CONTINUE. repeat for more pictures. Then scroll back up to the body of the message see where it says [img] put your cursor in front of [img] hit enter a couple times and it will give you a space where you enter the caption do that for all the photos and you will be ready to submit. IF WHEN YOU HIT SUBMIT you don't see the pictures no praying or hoping or wishin is gonna make them magically appear. YOU did something wrong go back and try again.There may be an easier way but I don't know what it is.
If your using a scanner You need to ask somebody else