Ford Eco Sport 2005 with security problems?

Ok... I lost the clicker (keypad with lock/ unlock and alarm enable) for my Ford Eco Sport and since then occasionally when I try to start the car I see a key lock icon on my dash blinking and my ignition seems to be disable. I would turn the key to start it and nothing would happen. No click from the engine, nothing. then I would have to wait sometimes 5 secs, sometimes 10 mins then it would start when I turn the key again. I think the problem is with my security but I don't know how to disable it. I've even tried disconnecting the battery to reset the computer... Maybe I did it wrong maybe I didn't. Can someone help me with this. It's annoying and sometimes embarrassing!