If you’re on a free listing and looking to add your website and social links, you need to upgrade your listing to a paid package.
You can do this by visiting one of your listings when you are logged in and you’ll see the option to upgrade the listing above the listing logo.
Once in editing mode, you can change your package, add your website and social links and then submit whereafter you’ll be required to pay for your upgraded package.
You can compare packages here.
Then you can upgrade using this guide.