how to download clubhouse app

As with any available app, open the App Store, search for the app you’re looking for and purchase it or just download it if a free app.

This assumes your device is new enough to run the minimum version of iOS or iPadOS required by the software.

As there are multiple apps in the App Store named “clubhouse” nobody here can advise you on the minimum iOS required for the specific app you’re trying to install. Note that an iPhone 6 cannot be updated beyond iOS 12.5.3 - it is too old for any newer version of iOS.

If the app requires iOS 13 or newer, then you can’t.