theme locked out my website

Hey guys I’m new to wordpress and I made a mistake installing my theme. I tried to change a few things up on my theme and I did it uncorrectly and now I’m locked out of my website and admin. When I try to enter to my website it says
:
Warning: require_once(/home1/gonzalezsaul/public_html/wp-content/themes/flatsome/admin/functions/functions.php): failed to open stream: No stream

Fatal error: require_once(): Failed opening required ‘/home1/

If anyone knows how to solve this problem please share your knowledge with me so I can continue building my website. Thank You