Removing/Hiding the footer in WordPress

Good day. Hello, I’m new here.

Website I’m working on: https://winedragons.com/

I want to remove the footer in this website I’m making. I’ve actually researched on how to do it, but everyone keeps saying go to Appearance -> Editor -> Edit footer.php.

I have no Editor option. I only have Appearance -> Edit CSS. I tried these codes already but they didn’t seem to work. (You just copy them on the style sheet, right?)

a) .site-info a {display:none;}

b) .site-footer {display:none;}

c) #infinite-footer {display:none;}

Also, there are no plug-ins option in the website I’m working on. And I’m scared to edit the source code of the website– I might ruin it.

Thank you in advance to those who are going to answer! 8D This is the only thing I have to do to complete this project.