Smoothing keyframe motion

I'm playing with curving/beliziar keyframe motions for the first time. I'm working in FCP5.
I have one video clip, scaled to 40%, it starts on the left side of the screen,
moves to the center, then goes straight up and off the top of the screen.
No problem doing it with "hard" motions.
But, how do make it into a curved motion...meaning instead of going hard
straight to the center of the screen and then up, as it's moving towards
the center of the screen it starts to smoothly curve upwards so it's not
a hard hit in the center and then up,...but more like a swoop up.
I've tried adding a SMOOTH to the centering keyframe but it won't let me,
and I'm not changing scale during the move.
Any input would be appreciated. Thanks.

right click or control click on your center motion point in the canvas and select "linear". It will change to a bezier point.
N

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