[. . . ] Put the carseat into the u-shaped part of the brackets and fix them by pushing the carseat firmly down. [. . . ] Put the carseat into the u-shaped part of the brackets and fix them by pushing the carseat firmly down. The hooks at the left and right side fix the carseat and hold it tight. Push the hooks at left and right side backwards until they are locked. Do not try to use different brand of carseat on our Viper Stroller or use different brand of stroller for our Lifesaver-Carseat. Always secure the child with safety harness seatbelt on the Lifesaver-Carseat. Always ensure the Lifesaver-Carseat is securely installed on the stroller during use. [. . . ] Always secure the child with safety harness seatbelt on the Lifesaver-Carseat. [. . . ]