Remove Author Card/Box from Pinboard Theme

I would like to delete or edit the Author Card / Author Bio Box. It’s unnecessarily cumbersome and distracting. My theme is called Pinboard. My website is https://www.TheInstantModel.com

I saw in another forum someone else suggested this:

“.entry-meta .meta-sep, .entry-meta .author { display: none; }”

…But it was for a different theme. Will this work? And if so, where exactly do I put it?

Any help would be appreciated.

Thanks