If your personal details change, you can update them a number of ways, depending on the information that's being changed.
Address - From the dashboard, press the drop down menu by your name and select Profile. There's a link under your current address that will allow you to enter new address details. Once you've added the new details, click Save Changes at the bottom.
Phone number - From the dashboard, press the drop down menu by your name and select Profile. Enter your new phone number to replace the old, and then click Save Changes at the bottom.
Email address - Just drop us a nutmail from within your account.
Bank details - check out the article on changing bank details.
Name - If you need to change your name, please email a scanned copy of your marriage certificate or deed poll certifying your new name to email@example.com.