how to install 1x squaretapper crank arm??? pano mag palit ng 3x to1x square type na crank arm???

how to replace a new crank arm? how to intall crank arm? how to single speed a crank? how to intall a 1x crank arm? pano magpalit ng crank arm? pano magpalit ng ng 1x chanring? pano mag pagaan ng bike? pano maiiwasan ang crosschain