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Feeds not workinf. Getting the following error:

This page contains the following errors:

error on line 1 at column 6: XML declaration allowed only at the start of the document
Below is a rendering of the page up to the first error.

My site is: https://rheumatologistdelhi.com

Upon validating with feedburner, it says:

Identify Feed Source
The feed URL you entered is:
https://rheumatologistdelhi.com
FeedBurner discovered more than one feed at that address. Please select one to use as your source:
Dr. OP Garg, Senior Consultant Rheumatologist in New Delhi, India talks about Arthritis and other joint treatments RSS Feed: https://www.rheumatologistdelhi.com/feed/
Dr. OP Garg, Senior Consultant Rheumatologist in New Delhi, India talks about Arthritis and other joint treatments Atom Feed: https://www.rheumatologistdelhi.com/feed/atom/

Please help.