Mercari is a website that allows users to buy and sell items from a variety of vendors. The site has an Instagram account, which allows users to share pictures of their purchases with friends and followers. To link Mercari to Instagram, you will need to create an account on the website and then sign in with your Instagram username and password. Once you have logged in, you can find the “Linkedin” tab on the left-hand side of the page. Click on the “Linking Accounts” button under “Profile Settings.” In the “Linking Accounts” dialog, enter your Mercari username and password into the fields below. Click on the “Create Link” button to create a new link between your Mercari account and Instagram.