Google analytics code

I set up our company site on X Theme about 5 years ago. I left the editing to another employee the last 3 years and just logged into their Google Analytics account to help them and it looks like Analytics has not been recording since March 2020 (oddly, Covid??).

Can someone please help me find where to do that on X theme, and also… I probably need to update a bunch of stuff. Ugh.

Okay, I tried updating Cornerstone plugin and now I have bigger problems. How do I find someone who can help me update the theme/plugin and fix my site?