Missing ease in function Graph edit handle

This video will help to solve your problems: 

you just click "separate dimension" it will appear the graph handle (right click at layer or click icon under graph)

sorry about my language

Bezier handles are only available on certain properties. In the graph editor press the g key to bring up the pen tool and then hover over any of the keyframes and hold down the Alt/Option key. I the pointer does not change to the convert point tool then try selecting a different graph type. If you still don't get a convert point tool (sideways V) then you have chosen a property that is not compatible with bezier controls.

For more help, and better help, paste a PrintScreen screenshot of your entire AE window with modified properties the layers giving you problems selected and the composition selected in the Project Panel so we can see what's going on. If you are on a Mac then press Shift + Ctrl/Cmnd + 3 to take a full screenshot of the app and drag it from the desktop. If you are on Windows press PrintScreen and paste (Ctrl/Cmnd + v) so we can see what is going on.