If you are not logged in, visit the Account page, once logged in, you can reserve a panel by clicking the “I want to draw this Panel” link

Use a drawing program to create a square image. Once done, start the
image upload process by clicking the File Upload icon.

After clicking the File Upload icon, click the Browse button.

Locate the image file you have created on your device and select it.

Now that the file has been selected, click the Upload button.

File uploading animation will appear for a minute or so. Your image should appear after that, press the Go Back link.

If everything looks good, press the Done radio button.

The “In Queue To Be Published” notice will appear, it will be there generally for a couple of hours.

Once the Queue waiting period is over, the Next Panel will be available for others to reserve & upload.