i need some satin to polish and i dont know where to buy it

umm satin as in the material wouldn’t be a good choice to polish metal, all you need is some metal polish and some polishing cloth, you should be able to get these from any hardware store or automotive store.
But if you are talking about actually satining your yoyo then you just need some emery paper around the 300 to 400 grit range. Also to get a realy good polished finish you can gradually work up with higher grit emery paper then use the metal polish to get a mirror shine.

well i got it covered with a bar of polish for axes thankz anyways