Problem with accessories and positioning them correctly

I tried to put an accessory on my humanoid.
It was positioned slightly down, so I moved the handle up with the move tool.

However, when I run it, it defaults back to how it was.

How do I fix this? I tried adjusting the accessories attachment positioning property, but I was unable to change it…? Like, I could change it, but whatever I did it changed back to the default…?

I want the humanoid to be able to move though… and like, function as a humanoid…

I was adjusting the AttachmentY property, when I should have been adjusting the Y value of the AttachmentPos property. Wow.

Nice, guess you learn something new everyday.