Find wireless device

iwconfig

Bring it up

ip link set mlan0 up

Scan

iwlist mlan0 scan |less

Set up wpa_supplicant

wpa_passphrase ESSID PASSWORD > /etc/wpa_supplicant/my.conf

Connect

wpa_supplicant -Dwext -imlan0 -c/etc/wpa_supplicant/my.conf -B

If your lucky dhcpcd ! other set ip addr and route

dhcpcd mlan0

ip addr add 192.168.1.212/24 broadcast 192.168.1.255 dev mlan0
ip route add default via 192.168.1.1

echo "nameserver 1.1.1.1" > /etc/resolv.conf