Use the forgotten password link on the sign-in page and we'll email a reset link.
If nothing arrives, check your spam folder, then check you're using the address your shop was approved under — it's the one on your application, which isn't always the one you use day to day.
You don't need an account to buy — but you can have one, and it is the most reliable way to keep track. Sign up with the same email address you used at checkout and any orders you placed as a guest are attached to it automatically; you'll find them under your orders. Without an account, a guest order lives at its own link and on the device you ordered from.
Didn't answer it?
Tell us what you're trying to do and we'll come back to you.