The ability for the browser/computer to remember the password is both helpful and a curse because many of us forget the passwords since the browser/computer does all the work.
Luckily you can get your browser to reveal the password rather then change it. Just do a Google search for "<browser name> Saved passwords" where <browser name> is the name of the browser you are using to log into Moodle. This will give you detailed instructions on how to reveal the saved passwords.
Once you find the password list, look for the password associated with your username. If there are different passwords, write them all down.
Once you have written them all down, go to Moodle - https://moodle.royalroads.ca/moodle and enter each password in manually till you find the one that works. (Please note that if your browser asks you if you want to save the password, do not hit yes, so you don’t accidentally overwrite the good password with a bad one.)