To reconnect a social account
On your dashboard, click on menu ‘Social accounts’,
Then click on the social network and click on the 'Reconnect' button (white icon) of the social account you want to reconnect.
You will be redirected to the social media site to reconnect your account.
P.S: Only do it if you've an issue to syndicate to your account. Sometime Token expire
Please see video below for sample: