To connect your new frient device, first you need to have your Homey set up. See how do that here.
Next, you need to install the frient app for Homey from here.
Then, you need to make sure your device is turned on and searching for a Zigbee network.
After you’ve done this, you can add your device using the app. You can get more detailed instructions here
Start with the router devices first (smart plugs, smart cable)
Add remaining devices based on distance from Homey. (Remember to add the battery-powered devices at the point of usage)