I tried to do "O" and "I" but they made only me slower. I'm trying to find out how to go faster not slower.
Here is a quote from the Official mod page:
Faster Sprinting and Exhaustion
This mod implements a faster, optional, configurable sprinting and exhaustion behaviour. It is merged with the standard minecraft sprinting and hunger behavior.
To sprint you have to move forward and click and hold the sprint button (default "TAB"). >Sprinting is currently possible for walking, swimming diving, crawling, and climbing. Sprinting optionally causes exhaustion and will automatically end when a certain configurable threshold is reached.
To change this default sprint button visit Minecrafts "Options"/"Controls" menu.
I have bold & emphasized the things probably needed for you.