Hey Armando,
You have to enable this setting in EasySocial:
https://take.ms/EWJAS
Before you can see the buttons, you have to setup the respective social media logins on the extensions first and make sure their plugin is enabled:
https://take.ms/VQTnl
You can see this example from my local instance after I have setup Facebook and Twitter login on JFBC:
https://take.ms/MJILQ
If you have any enquiry regarding their product, feel free to consult them.