Typically, passwords should be updated as often as every 12-15 weeks to reinforce security. We highly advise doing so and making sure to keep track what they are changed to.
If you've forgotten your password completely, refer to this article. However, if you simply want to change your password, here are the steps:
STEP 1: Log in to your website dashboard (if you don't know how to do that, click here). Once you're in, click on the Settings tab to the left.
STEP 2: You will see a Password and Confirm Password field on this page. Fill those two in with your new password and click the Save button at the top right corner.
You will see a message saying The changes have been saved at the top of the page to confirm your password change.
If you have any more questions, feel free to submit a support request here.