If you need to change your password for any reason this is simple to do using the following steps.
Navigate to Settings and then click on Account details:
Next, click on the Change button next to Password, where a prompt will pop-up asking to Confirm if you wish to change your password:
Once you've clicked Confirm above, you will see a confirmation message in the bottom left corner of your screen and then receive an email with instructions on setting a new password:
Please note: this will only work if you login using the email & password flow. If you aren't receiving an email it's likely because you usually login with the Google flow. i.e. if you usually click "Continue with Google". If you want to change this you can do this via Settings > Account details.
If you've forgotten your password and are unable to log in, simply click on Forgot Password on the login screen:
And then enter your Email address and click Continue for a Password reset email to be sent to you: