The free version of FlyVPN (the one downloaded by default) lets you activate the VPN three times a day for 20 minutes. If you want to use it more than that you'll have to register for an account and get a premium subscription.
Using FlyVPN is quite simple: just pick which country you want to channel your connection through and press a button. In seconds you'll be connected and can start enjoying a private connection with zero restrictions.
FlyVPN is an excellent VPN app. Tons of countries to choose from, a stable connection with no ads, and free for 20 minutes a day.