Guitar User Chord Palettes

Hello everyone,

Good afternoon. I have created a series of chords for Jazz Manouche and I would like to put them in a specific palette for this type of chords.
I have created a new chord palette, but I can't (can't find a way) to put the created chords into my score. In the user manual I cannot find a place where this procedure is clearly indicated.
On the other hand, I see that they talk about "Inspector" but in my version of Musescore (4) I don't see where to access it.
Can anyone tell me how to do this in my version of Musescore?

Thank you so much