How to use an MRT token
Now that you have the small black plastic coin sized MRT token don't drop it! They tend to bounce. Proceed to the metallic barriers. Hover the token above the red panel and the barrier will open up. Make your way through. Simple as that. You keep the token as it's not placed anywhere. Don't lose it!
Proceed down or onwards to the train platform you need. The platforms are generally named with the last station on the line and there is a station map on the platforms.