Hi @Dedsec_Nethunter
1)Providing the drivers are installed . Go to "Networking" then look for "Wifi Client Mode" Select the Interface ( the third radio should be wlan2 or wlan 3) then click "scan".
At that point connect to the wifi hotspot you want to use ( enter the password) and hit "connect".
You will know if you are connected as you will then see an ip address in Wifi Client mode.
2) Once connected, then look above that tab and you'll see Route. You just need to define the default route for that Wifi ..Put in the gateway ip select the adaper ( wlan2 or wlan3) then hit update route . You should then see the default route table update with the newly added ip of your gateway and voila :)
Regards