If you're logging into Mercu using your email and a password, you can change your password using the "Forgot password" flow.
If you're currently logged in, log out first. Then visit app.mercu.com.
Step 1: Enter your email and click on "Continue"
Step 2: Click on "Forgot password?"
Step 3: Follow the instructions and check your spam or junk folder if you don’t see the reset email in your inbox.