Once you have located the access point you want to connect with it' time to start using another command called iwconfig.

iwconfig is used to configure your wireless adapter so you can connect it to your preferred network. You can configure every thing from the ESSID to the transmit power of your wireless adapter.

sYNOPSIS
iwconfig [interface]
iwconfig interface [essid X] [nwid N] [freq F] [channel C]
[sens S] [mode M] [ap A] [nick NN]
[rate R] [rts RT] [frag FT] [txpower T]
[enc E] [key K] [power P] [retry R]
[commit]

The syntax for using the iwconfig command is: iwconfig (interface name) then what ever you want to configure. So if you want to configure the ESSID you would type iwconfig wlan0 essid “network name”.

Now that you know that the tools are there go to work!!!