Changed http to https

I need help fixing my site after changing the site and home url from http to https and now the site does not work on the backend to change it back.

I am new to using WordPress, so I do not know all of the in depth steps that might need to be done. I also used a one click install to install WordPress into my web hosting, so I do not have the application files directly on my computer.

If someone could help me out as soon as possible that would be great as I was in the middle of working on my website and trying to get it ready to launch in the next week. Thank you.