Your name, email, password and phone call settings can all be changed from your account tab. Scroll down until you see the settings section:
Clicking on any blue edit text will let you edit that field. Clicking on edit name will bring up a pop up:
Where you can type new names and click on save your changes to confirm them.
If you click on edit email:
The same applies, but clicking save your changes will log you out and you will need to log in again.
Clicking on edit password will follow the same procedure and you will also need to log in again:
Editing the phone calling settings and your phone number are described here
For the other functions which can be edit from our account see our article here