First, you will need to scan the network you're on to find the Unifi Device. You can use Advanced IP Scanner. This App is free to use.

Scan your network, and then get the IP address of your device.

Next, click on Start, and then type CMD. A new black window will show up on your screen.

type the following ssh -l ubnt ip_address_of_unifi 

example
ssh -l ubnt 192.168.10.106

Then it will ask for a password; enter ubnt

Once you're logged in, you should see something like this

We need to adopt it to the controller

Type the following

set-inform http://unifi1.121consulting.ca:8080/inform

This is the same for all devices. After you type set-inform http://unifi1.121consulting.ca:8080/inform press enter

Then the screen will show this

It says Adoption request sent to 

Login to the One2One Consulting Unifi Controller

Then go to the site you wish to adopt it to.

Then look for your device.

Then click on the "Click to Adopt"

Then wait for it to Adopt, then make sure you update the firmware on the device. 

Then repeat for each device.