To generate a secure URL for an image you must have an FTP client and hosting on a secure server. As options vary between FTP clients, the details of these instructions may differ slightly from what you see.
Connect to your secure server using your FTP client
Upload your image
Once the image is uploaded, right click on the image and select "Copy URL."
Paste the URL into the image field in your Attendease admin
If the link is successful, a preview window with the image appear