You can edit your contact info at any time by accessing it from the Edit View of your account.
From Dashboard, go to the Settings tab then go to Contact Information.
It is highly recommended that your Contact Information be displayed somewhere on your site. Otherwise, your site visitors (such as potential new clients) will not have any way of contacting you.
It is recommended that the minimum information you provide is your email address.
The contact information can be displayed in the homepage when the Classic Layouts are applied.
The contact information is also displayed in the Contact Page. See this guide for how to customize your Contact Page.
See this guide on how to submit the links to your Social Media pages.