You have to change touchpad panel which is responsible for right-click action in your keyboard. Every touchpad normally has two buttons. First is for right click and second for left click. It is inbuilt with your touch panel.
You have to find touchpad with your laptop model number online. Buy and change it if you are able to find it.
Simply remove old touchpad using a screwdriver and pull out. Remember to remove cable plugged in motherboard and touch panel.
Connect motherboard cable with the new touchpad and install just like you have removed its old one.