Press the top button to wake it up.
If the screen is blank it needs charging - you'll find the micro USB charging cable in the box behind your Beeline device.
Pop your Beeline out of its strap:
Plug it in for a few hours, and your Beeline will have enough juice for 30 hours of riding (10 hours with backlight on) and at least a month on standby.
Please note that there is no "off" button for the Beeline Velo.
The original Velo does show the Beeline logo at all times. The screen is super low power, and the device will remain powered for months in that state.