Here's the instructions.
You could also upload your pics to a photo hosting site like "photobucket" or "picasaweb" and then attach an image link to each picture.
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HOW TO UPLOAD PICS TO YOUR GALLERY:

~To add pics, you first have to "upload" them to your "gallery".

~Go to "Gallery" and click..it's located along the blue horizontal strip toward the top of the page, and it's the second item from the left.

~Then click "Gallery links"...which is also on that blue horizontal border, 7th from the left side. When the list lights up, scroll down to the "Upload Photos" and click.

~Then the screen will show up where you can attach up to 5 pics at a time from your gallery. Look for "Choose file" button, click, and then find the pic on your computer.

~After you've selected up to 5, scroll down about 4 inches and click white button "Upload/Submit". Takes about a minute or so to do it.

~then there's another screen that comes up where you can add text to describe picture/s...than click submit button.

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ONCE YOU'VE UPLOADED THE PICS TO YOUR GALLERY....HOW TO ATTACH THEM TO A POST:

~If adding to an existing post of yours:
Go to your post and hit the "Edit" button toward the bottom of the first post.

~Then hit the white "go advanced" button on the bottom of the post.

~Then on the right side you should see a small gray box titled "My pics" and inside the box there will be the words "Open" in blue letters. Click "open".

~That will take you to your gallery and you just click on which pictures you want to upload to the post.

~In the body of the post -Hit a "return/enter" after each picture you attach. Otherwise it doesn't always space the pictures correctly.

****NOTE**** Sometimes, clicking on the picture you want does NOT make it (well, the code language) show up in the box where you are editing. I don't know why this happens, but if it does, I just wait an hour or so and start all over, and it usually works then.