To change any of your project settings, firstly click into the name of the project you wish to edit in your account dashboard. This will then open up the project you wish to edit.

Now click 'General' at the bottom of the left sidebar:

In this area you alter any of your project settings, you can rename the project, change the timezone or the default video codec. Once you are happy with your changes, click 'Save' to finalise the change.