Roll, backflip, frontflip and the cross-axis roll are the four basic tricks. They work all the same. You do a full throttle to gain altitude, then press in the direction you would like to flip/roll and throttle down to about 50%. Keep direction until the quadcopter is in level position again.

At half turn backup throttle again to keep the altitude. Usually you need full throttle for a short time to intercept the flip movement. Altitude is your friend!

trick #1 roll

watch on  youtube: http://www.youtube.com/watch?v=S4sAJM1uRD0

trick #2 backflip

watch on  youtube: http://www.youtube.com/watch?v=1fh_D6R1O9Q

trick #3 frontflip

watch on  youtube: http://www.youtube.com/watch?v=ceO6hz7J6zU

trick #4 cross-axis roll

watch on  youtube: http://www.youtube.com/watch?v=oLAa1wSlnZc