How to sync blog posts with Twitter and Facebook

I recently moved my site over from wordpress.com, and I had it set up where I could sync my Twitter and Facebook to my site, and every time I made a post it would post to those socials. I’ve hard a hard time getting that going on www.remarpro.com. Before I thought it was part my Sharing section in Settings and my Widget section, but I can’t seem to find the linking capability in there. Do I need a plugins, or multiple plugins to make this happen again?