Welcome.
Below is a link to operating the turnouts if they are electrical and not DCC DCC turnouts use a decoder.
You can look in the information page for info. Take time to look through the Bachmann site. Lots of good info.
https://www.bachmanntrains.com/home-usa/dwg/dwgs/HO__6_Turnouts_Instructions.pdfThe App is only for the loco. That should be in the instructions. Different technology.
Good luck.
Rich