Those Abu Ambassadeurs are awesome once you get used to them. Which model do you have?
First make sure your rod isnt too stiff. Make sure whatever you are trying to cast isnt too light. Make sure your line isnt too thick/heavy. Tighten down the spool tensioner and let off little bit at a time when you get more used to the action. You can try to lube rotating assemblies with heavier grease, usually works well but inconsistent.
With this reel you are prob trying to put too much muscle into the beginning of the cast, then it nests up- the key is a smooth cast and follow through with your swing, dont abruptly stop the rod swing. And as others have said, youve got to use your thumb as brakes, i like to brake on the spool side, some like to thumb the line, whatever feels comfortable to you. Once you get it down, they usually cast for miles.
OR you can mag it and you can cast without thumbing the spool if you like but you will sacrifice distance.
Low profile baitcasters are a bit different, i like to use a little more wrist action. They are much more forgiving than conventionals and most have adjustable mag brakes, but again the trade off is distance.