1) Their stats are quite shady and shitty.
Nice stats should probably look like this, for example:
https://etn.spacepools.org
https://pool.ellaism.org

2) Start mining and after 5 minutes check https://cryptogrinder.com/workers
Do you see your wallet there? Good, you are mining.
What is your hashrate?

3) After a "while", you should get paid, who knows how long does it take, see 1).
For payments, check http://explorer.fujicoin.org/ - paste in your wallet.
I've tested that pool several days ago and it "works".

4) Maybe you should consider mining another coin and instead buy some FJC.
For $10 you can get like 1250 FJC...