Hi everyone,

I am EXtremely new to roadbikes. In fact today I got my first one. Used. Its a Trek 2300 (1999) model. The person I bought it from had changed the shifters to the kind that are integrated with the brake levers. I believe these are called either Dual lever shifters or STI shifters.
Now here is the part that is going to make you laugh. I DON'T know how to shift with these things? How do you shift up and down?
I know its a really easy answer but I just couldn't figure it out and didn't want to mess with it and screw it up too much.

Thanks you for you help.

Tan