Details: App selection

Assuming you use a smart phone, there are quite a number of good apps for handling twofactor authentication.

A simple one that is easy to get going with is Google Authenticator. It's available for Android and iOS.

Authy is another alternative that features cloud storage and sync between devices but needs some initial setup. Available for Android, iOS and as a Chrome App for computers.

Password handlers and security solutions also often feature two factor handling. E.g. Lastpass and Duo Mobile.