Like Craig says, you can upload several, but make sure they appear on the left in the column where it says 'choose file to upload. Then you click on 'upload' at the bottom left of that window where the selected files are listed, and wait until it is clear the pics have ben attached. Then scroll right to the bottom and click on 'close this window'. That closes the attachment key window. The you go back up and click on the 'submit reply' button. You should see that your files are clearly attached in that window above the submit button. Be aware some cameras take photos which are so hi res and space hungry the number might be less than Craig indicated, in which case you need to downsize them a bit. Using an external place to save pics, then posting the URL from the Insert image icon at the top Like Ben2go mentioned might get round that however. Markpierce posts plenty of pretty hi res pics using that method I notice.
PS. Love your boat.