You can change most of your account's settings in the Settings menu. Here's how to find it.
1) Login and view your receipts to the account you wish to modify
2) Click on the button with a cog/gear to the top right of the screen and select "Settings" from the drop-down menu
The settings menu(s) will then appear to the left of the screen.
With this menu(s), you can
- Check your usage for the current billing period
- Invite or remove users
- Upgrade/downgrade your subscription
- Change your billing details
- View your billing history
- Change your mailing address
- Choose your account's default currency
- Change your password