Hello Martin,
Start your blog (new word for story or report) and once you have done that then on your desktop right click and select 'New' - 'Folder'. Give it a name for example Victory, and this is where you can store all your photos of your build.
So, you are now on your blog, and have informed us of the work you have done... For example -
'Update,
Today i stuck myself to the mast and missed my tea....'
Then if you look to the bottom left, you will see the button marked 'Attach files' click on this and navigate to your desktop and the folder 'Victory' double click on it and there you will see all your saved photos. Select the one you want and click on the 'Open' button and the photo will appear as a small square on the bottom left of your blog. At the top left of the photo it will say 'Insert' click on this and then 'Full Image' You will notice that the cursor is now on the lower right of the photo, hit the return button and the cursor will move to the next line down and you can add comments or continue to add more photo's.
Hope this helps,
Mike.