1.use crossscrews to loosen the screws. 2.holds both ends with hands and draw apart it.3.Put up the shoes4.Hold both ends with hands and push it tight5.take out shoes and tighten the screws6.Put up the feet just as the diagram,and tight the elastic7.must wear protecting equipment8.Prohibition in danger places,9.Any result in hurt,we will not take the law duty.