In your MOHAANetDemomainconfigs folder, there is a file called unnamedsoldier.cfg

Open it with Notepad or any text viewer, and see if you can find a line that says seta fps "0"

Change the 0 to a 1, and save it.

If the line is not there do this...

Look for the lines that read:

//
// Cvars
//

Directly under the last two forward slashes, type: seta fps "1"

So now it should read:

blah blah
blah blah
blah blah
//
// Cvars
//
seta fps "1"
blah blah
blah blah
blah blah

Save the changes, and tada.

You'll now see your fps whenever you play.