You have to have 10 posts before you can upload a profile pic (called an Avatar). Once you get to 10 posts, give it about an hour to let things update, then click on your user name at the top right side of the Camping Board and choose the "Avatar" option and it will guide to how to upload.
That's for the avatar picture - there are two ways for regular pics. At the bottom of the thread is an "Upload a File" button and you can choose it and select a graphics file in an allowed format (jpg, png, etc) and upload it and choose the "Full Size" option button (not "Thumbnail", please). The new upload option became available about a year ago with the DIS had a major software upgrade.
The old way (which I used for the pictures above) was to copy the IMG link for these images which I stored on photobucket. Since that's where the picture is, that's how I included it.
Either one works. (long answer for those who are reading and are new to the DIS).
Bama Ed
PS - You didn't say how many people will be in the tent but the Kodiak Canvas Tent website says that tent appears to be 10 feet square (10x10) as fyi.