After logging in to Socrative, click on your name at the top right corner and click Profile.
In the Profile header, you'll be able to change your name, email, or your password.
After making your changes, click Save.
Note: If you do not see a "Change Password" link then you likely registered in Socrative using Federated Login (e.g. Google). You will need to change your password with Google.
If you need to set a Socrative Password (for example to work with Showbie Integration). You can create a new Socrative password by clicking the "Reset password" link on the Login Screen.