Tutorial Video. Step by step below;

1

First Step

2

Second Step

Select your Server

3

Third Step

Under General Section, Click the Files tab

4

Fourth Step

Upload a PNG icon that is 64x64 in size

5

Fifth Step

Click on the Three Dots at the extreme right side of the uploaded file.

6

Sixth Step

Rename the file to server-icon.png

7

Seventh Step

Restart your server

There you go! You’ve just changed your server icon.
How to Reset your server