Hi and welcome to the SINS community! Always glad to have more players, anyway as for your situation, when you log onto Ironclad Online you are taken to a screen where you see your user name i assume, what you would do there is the following:
Step 1: Click "Add Player" tab and it will prompt you to enter a user name, put your user name there
Step 2: Once you have your user name entered, it will appear in the box on the lower left hand of the screen, highlight your user name and click on the tab to your right that reads "Use Player"
Step 3: You should be taken to a game lobby where you will see other player names to your right and options to host or join games to your left and a chat box in the middle. Enjoy!
Also, sometimes you may not see any players in the game lobby but dont worry, sometimes people are either in a game that havent finished yet or in different lobbies or you just happen to be on at a point where player base isnt at its peak.