connect BareDuino with Grove Relay

Hi,

I would like to know how can i power an Bareduino nano (seeedstudio.com/depot/baredu … ?cPath=6_7) ?
There is no onboard input

Also i want to connect it to a relay seeedstudio.com/depot/grove- … Path=39_42 and a Xbee wifi. Is that posibile ?

The ideea is to have a small wifi relay.