Classic App to Legacy Business

I’ve been using the classic app, and now I’m on a legacy Business Plan where I can freely use custom CSS, notifications, and all the features for any new app I create. But, even though the classic app is under the legacy business plan, I can’t use those features. Is there a way to turn the classic app into a legacy business plan app so I can use all those features? Your kind help would be appreciated.

You will need to covert it from a Classic App to a New App.