You have to plug your st16 into your computer by usb.
Then double click anzhen4
Double click internal storage
Double click flightlog
Double click telemetry
Double click whichever log you want
You also need excel on your computer because they are in excel format. Don't know if any other will work.
Hope this helps.
The telemetry files are just bare data (.csv format) that can be read in any spreadsheet program, if you transfer them onto your PC or laptop.
If you want to do more with them, you need a telemetry viewer, or parser. With the latest firmware, Yuneec include a simple Flight Log App which can show your telemetry on a map. I also develop an App (Flight Center, link below) that allows you to view telemetry, combine it with the video you've recorded and share it to your PC. There are also websites, such as Exmaps and software such as DashWare which do more with your telemetry, though some of them will need you to convert the files before you can use them.