First, put the buttons you bought face down on the table, and then lay the buttons on your pants flat on the table. Pay attention to the correct position. The outside of the clothes is facing down, near the bottom of the button. Then pick up the nail, aim at the bottom of the button with a hammer and knock it into the bottom of the button completely. It is easy to break the button with great attention and strength. If the button of jeans is broken, you can first cut off the aluminum feet inside the clothes with pliers or scissors, then take off the whole button and nail a new button.
Jeans button installation tutorial: generally, the first thing to do is to put the trousers in the correct position where you want to nail the button, pick up the nail, put it down at the bottom of the button, and knock the nail into the bottom of the button completely with a hammer.