Yes, you can link your PayPal account to Mercari. To do so, simply go to the Settings tab and select Payment Methods. From there, you will be able to add or remove payment methods, as well as edit your existing ones. If you scroll down, you will see the option to add a PayPal account. Simply click on that and follow the prompts. Once your PayPal account is linked, you will be able to use it for all future transactions on Mercari.