Welcome to the world of bikes! Stick around we'll have you slingin' the lingo in no time
There are a few thing we need to know to get you started repairing what you've diagnosed, which by the way is half the battle as you don't know how to fix untill you know what to fix.
Type of bike (Road, MTB, Comfort)? Number of speeds front and rear? What gear combinations are you experienceing the problem? Type of shifters, how do you shift? Do you have a bike shop near by? Are you familiar with the parktool.com website?