How can I let my mac read an application as a known creator to keep on the security while using it?

Hey , whats up?

I bought my mac mini, I want to keep it safe from unknown creators and more and there is a great app that I'm using and the creator is not marked as a known one or downloaded from the app-store so how can I let my mac open this app while the blocking will be on the option "Allow apps only by known creators & App-Store apps" ?

Thank you very much, Nadav.