To add on to what George said, with the timeline highlighted in the project panel, or if it's the active panel you are using, press "cntl + K" to open up the Comp Settings. That's one a shortcut everyone should memorize.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.