how to access beaglebone blue via wifi?

I’ve been going in circles just to get a servo to run!

Need help on how to ‘on’ my wifi when connecting to external power?

when i’m connected to pc through usb, the wifi led is on and everything works fine.

But, i want to connect to external power and hence able to test the servo or run things via wifi. By the way
can i just just the barrel power to run/test dc motors and servos? Or need separate power using the lipo battery
for each of them?

The problem i realized is my wifi led light is off, that means wifi are not on the beaglebone blue. How
do i on it to access the beaglebone blue?