Hello,

1) Please try adding the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.

.wd-entry-meta .meta-author {
    display: none;
}

2) Please read the following article for help:

https://www.wpbeginner.com/wp-tutorials/how-to-completely-disable-comments-in-wordpress/#:~:text=To%20do%20that%2C%20go%20to,on%20all%20your%20future%20posts.

Best Regards