Geeetech

Hello I am noob and I am having problems manual leveling my A30. I already looked online but didn't help.
It seems when I choose a mesure for a point it changes the mesure of all the points.
Can someone please help me?
I'm desesperate

Press the lever, push the filament through the feeder and reach the end of the throat.
Then you can try to heat up the nozzle (or heat up before loading the filament, it's both ok), and after heating up, control the extruder to move like 1mm each time.
https://www.youtube.com/watch?v=-Bd8FphkNTw ...

I'm a complete noob. I have no idea on how to load the filament.
Can someone please help me?