Grammarly Uninstalling Issues

I recently downloaded Grammarly in hope that I will be able to make my essays better, only to find out that it cannot be used on Google Docs yet. So now I want to uninstall it to make my storage space available for something useful. However, I ran into a problem: uninstalling required two steps that both have problems. If I wanted to uninstall it from the Safari extensions menu, it told me I need to get rid of it in Finder first.

Then, Finder wants me to get rid of Grammarly because the application is still in use!

What should I do if I want to remove Grammarly from my computer if I am running on Catalina 10.15?