If you have a Windows 10 PC it will work with it. You just need to type phone in the search bar on the bottom of your PC screen. I don't know if it will work with mac though.
Yes, go to the start menu on your phone, type in phone companion, and then open the application. Also, make sure Bluetooth is enabled on both your computer and phone, and make sure they are both on the same network! Ie: not one on the 5-GHZ and the other on 2.4GHZ, if one is on 5GHz, then the other should be as well, if your computer is wired to the network, then it doesn't matter. After confirming that, just follow the instructions on screen on your computer!