Add facebook link on my blog

i know this topic is frequently opened but in my case it’s a little different. I have a domain, and i registred to a free domain to test things on wordpress. the free domain is : https://www.bestofh.net63.net ; i wanted to add a facebook link on the top of the site like this site : https://www.tedxparis.com and if possible twitter too. Please tell me if there’s a widget or something for that, or editing some code …

Thank you,
Cordialy.