To change your username, password, or email address,
1)    Open a web browser on your computer
2)    Go to www.qik.com, and log in.
3)    Go to Settings -> Profile

4) Once you are done, remember to click Save.

To change your phone number,

1) Check on the "I agree to Qik's SMS Terms"

2) Type in your phone number and click on the "+" icon.