Can't use Visual Editor, site deployed by previous designer and can't authenticate repo

Currently wanting to make updates to the site, but unable to open Visual Editor because the site was designed and deployed by someone else. I get an error because there is a 404 error when it authenticates previous designers github repo link.

Do I need to DL the previous deployment and upload to a new Github with repo link? I’m a little confused because the site is set to continuous deployment, but it appears that there’s not a repo link it is deploying to in Github.

Any suggestions or advice welcome, I’m still a novice in Netlify. Thanks

Which site is this about?