This isn't actually an issue with EasySocial. In order for you to add feeds on Feedburner, you need to add the RSS link and not your site's URL. Which feed are you trying to add on feedburner?

Hi!
I want to subscribe my website to Feedburner, I can not because there is a problem with a line of code that has to do with a line of easysocial, I attach some pictures ...

Regards

Feedburner is a feature which allows you to submit feeds in feedburner. You CANNOT place your site url into feedburner.

You MUST use a valid RSS Feed to add in Feedburner In short, you can't just put in your URL in feedburner.

P/S: By the way, the last I recall, Feedburner is already in it's closing phase, https://en.wikipedia.org/wiki/FeedBurner so you might want to reconsider this.

Thanks

No problem