Here are a lot of threads which handle that topic.
With the search function you will get all information you need.
Basically you need to know
What your motor is rated to (6374 should be about 60-100a)
What your battery is rated for discharge
What is your focbox rated for
Let’s say your motor is rated 80a start with
Motor max 60a
If your battery is rated to 60a start with
Bat max 40a
Motor min you can set to the same value as your motor max just in minus, so -60 or -55a
Your bat min depends on your battery max charge value… idk your lipos so you need to figure out by your own. Something between -10 and -20a will probably hit that, but check your battery specs for it.
To enable your bt module you need to set your focbox in ppm and uart mode and choose the right baudrate.
During your first rides check your values.
If your motor or your focbox becomes too hot lower your values. If you don’t have enough power and still everything runs cool (40-50degree) then slowly rise up the values