Visit any Passenger Service Centre or TransitLink Ticket Office in Singapore to get your EZ-Link card.
Pay $15 to obtain your new card. This will leave you with a $10 travel balance after the $5 card fee. You can also elect to put more money on your card when you first get it--the current limit is $500. You can reload your card with additional money almost anywhere--even 7-Eleven offers top-up cards.
Hail a taxi on the street or call a taxi service to have a car pick you up. Be sure that they accept the EZ-Link card if you do not have another form of payment. (All SMRT taxis are now equipped with card-readers.) Enter the taxi and tell the driver your destination.
Once you've arrived and the trip has been calculated, tap your EZ-Link card against the sensor--or hand it to the driver and have him do it. It should automatically deduct the cost of your trip from your EZ-Link card.