ADVICE ON IMPORTING MUSIC TO MUSESCORE

Do you mean, you wish to play music on your keyboard and then have it notated? Do realize that this is very much an inexact science - trying to guess at rhythms, which hand is playing what, how to spell accidentals, etc. That said, I would try the following:

1) (easiest to enter initially, but will probably require the most work to fix up later): record your playing into a sequencer (perhaps a built-in on your keyboard) and save as a MIDI file, then open that MIDI file in MuseScore using File / Open

2) (hardest to enter initially, but requires the least work to fix up later): use the regular note input mode in MuseScore to enter notes one a time just as you would if you weren't using your Clavinova. See https://musescore.org/en/handbook/note-input

3) (a compromise between the two): use the "Real-time (automatic)" input mode in MuseScore explained in https://musescore.org/en/handbook/note-input-modes#realtime-auto

First you need a new keyboard, your capslock key is broken