Site Gone

Hello! I am setting up a new wordpress site. I had things working well and was fleshing it out with content when I made a fatal error, and now the site is just gone. All the files are still there in the control panel, but I get an error page at the url. I had been trying to get a particular post to stick to the front page by itself and changed the url to that category/post in the site settings page, and that’s when it went first to a 500 error. It displays the same error page (“Internal Server Error”) when I try to access the wp-admin page, as well.

Can anyone help? Is it something to do with my htaccess file?