G'day Charlie,
OK, I see that CyberJack has pointed you at the 'how to' page for loading pics
HERE.
The 'browse' button lets you navigate to the pic file [JPG or PNG format] on your PC; then once it's selected, click on the 'Add file from your PC' to upload it to the ODK server. Your file size is well under the limit [4Mb]. Repeat the 'Browse/Add' steps for each pic.
When you've 'added' the desired pics,
then click the 'All Done' button to insert the image tags in the post editing window. The pics will be visible if you click on the 'Preview Post' button.
If you later decide to add more pics, just click on the 'File upload' button again.
ODK handles pics a bit differently to many other forums, in that we prefer them to be uploaded to the ODK forum server.
That way they don't succumb to 'link rot' in time, as is often the case for pics stored on external services like photobucket.