jitter, to make it simple, represents the amount of interference on your signal. the lower tthe jitter, the better. recommended amount is 1-4.
to know your jitter, and other stats of the AP you are connected to, open your canopy page. click configuration>radio. take note of the value where it says color code.
next click tools>AP then click AP eval in the bottom. look for the color code that matches the one you saw on radio, that is the AP you are connected to.