You can login to your account at any time and amend your password.
If you're on mobile, head to your account by clicking on the menu icon on the top left hand corner of your screen. When the menu pops up, click on the My Account icon (a body outline).
On desktop? Click the My Account icon on the top right hand side of your screen. Once signed in, click on the My Account dropdown and navigate to update password.
This is the page you need! You'll be prompted to enter your existing password, and choose a new password. Once you have chosen and entered your new password, you'll get a confirmation message and you're done!