I've now added the ability for users to upload their own pics and video to their posts. Try and keep the image size down to a maximum or 600 pixels wide & 600 pixels deep & under 100k in size. Make sure they are relevant to the post you are adding them to. Posts still need to be approved by me before they will be posted to the site.
To add an image click on the icon circled in the image below when you are making your post and upload the file from your computer.