Browsec is not a browser, it's much better. It redirects your whole device through the VPN server. Your browsers and other apps (social media, messengers, you name it) work as if you were located in the country you set in Browsec.
Tap the toggle at the bottom of the main screen:
Tap the country if you need to change it:
Once the world map turns green, all the apps are now connected via Browsec VPN. Switch to your browser or any other app and use it as you normally would.