I am going somewhere without Wi-Fi but there is good chance a neighbour will have BT Wi-Fi! My tablet and phone have the BT App but cannot find the Windows 10 App for my laptop!
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When you say the BT App I have assumed you mean the BTWifi app.
You use the BTWifi app to log onto the BTWifi signal and once logged on you use the Internet on your tablet/phone in the same way as you would at home.
If you are using your laptop, you connect to the BTWifi signal in the same way as you would connect to any wireless signal. Once connected you open a web browser and it should open at the BTWifi log on page and you enter your user name and password.
See link for in depth information.