*shrugs*, here is a picture with "Find Server" added. Just a reminder that your background looks different then mine due use a different background. But the fact is that "Find Server" is on the left side in the main menu.
You can always use STEAM to do it. First open Steam, click on "View", and then on "Servers" as on the picture below:
Then, at the bottom you'll see the filter button, click it:
Select Earth Special Forces:
Then click on the refresh button, and you'll see all the Earth Special Forces Servers: