Hover over the class icon, click> to change the class name> choose to upload custom icons or use the default icon set for the class icon> Click the update is complete modification
Hover your mouse over the class icon, click on the class icon, click on the class name, select a custom icon to upload or use a preset icon to set up the class icon, click update to complete the modification
Hover the mouse over the class icon, click > change class name > select custom icon to upload or use default icon to set as class icon > click Update to finish the modification