Editing these 2 files should work.

1) /etc/network/interfaces

sudo nano /etc/network/interfaces

auto lo

iface lo inet loopback
iface eth0 inet dhcp

auto wlan0
allow-hotplug wlan0

iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

iface home inet dhcp
iface other inet dhcp

iface default inet dhcp

2) /etc/wpa_supplicant/wpa_supplicant.conf

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="NETWORK1"
        #psk="WIFIKEYS"
        psk=197ee6a0f3bbb0ee1530cf248fdf876bc1385eb935a4b1dd548e4c43dd8b817f
        id_str="home"
}

network={
        ssid="NETWORK2"
        #psk="WIFIKEYS"
        psk=59d9627450791660c06434770cadaa0f446d07bbe22cd1d35795ddf7c335f7dd
        id_str="other"
}

network={
        key_mgmt=NONE
}

3) Optional: Parameter ‘psk’ can use ASCII passphrase (commented out above), but you can save wpa_supplicant a little time by pre-computing the PSK keys with wpa_passphrase.

wpa_passphrase "NETWORK1" "WIFIKEYS"