You can't. However the last games played were 2011 so the rating system will quickly find your approximate rating. Your Glicko RD is very high so your rating will bounce around like it's on a trampoline for awhile. Once it gets under a 100, the ups and downs become more moderate. You could google Glicko RD or do a Search Forums if you want more info on how it works. I think Wikipedia has the math if you like complex algebra.
How to reset my chess rating?
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My father used my account to play chess in the past, he is chessmaster so I dont want to start off with his rating, how do i reset it?