Glicko RD is so easy even a caveman knows it is the standard deviation of the estimate of your "true rating."
If you take your Glicko RD and add or subtract it to your rating, then you can be about 67% sure your true rating falls in that range. If you take twice your Glicko RD and add or subtract that to your rating then you can be about 95% sure your true rating falls in that range.
Under Stats I see a Category for Glicko RD...
Is this a Lizard selling Insurance?
I have no Clue...