Icon Specifications:
Size: 64x64 pixels
Filetype: .PNG
Making the Icon:
1. You will need to have a picture or have created a Minecraft server icon.
2. You can convert a picture for icon use using this handy tool: http://www.genfavicon.com/
3. Once your picture is converted. Click the "Download: jpg" to download and save it to you computer.
Upload the Icon:
1. On your Multicraft panel choose

2. Click

3. Click on

4. Drag and drop your image into the designated box like the image below shows you.

5. Click

6. Click

7. Rename the image to "server-icon.png" as shown below.

8. Click

Here's a video that details this process: