on its way

ORDERED THIS BELOW , it is to get a signal in the loft , is it just plugnplay or do i need to do other stuff first ?
GL.iNet GL-AR300M Mini Travel Router with 2dbi external antenna, Wi-Fi Converter, OpenWrt Pre-installed, Repeater Bridge, 300Mbps High Performance, 12

You need to set up the router according to Overview - GL.iNet Docs