Generally speaking, most web browsers will remember your password for you. Also, there is “BitWarden”, which is a free service online at https://bitwarden.com, which will securely remember all your passwords for you. Another solution is 1Password, although that is a paid solution.
With any of these, you do not need to remember your password: the product will fill in your password for you.
After you have logged in, and unless you explicitly log out, your web-browser will likely remember that you are logged in, and you need do nothing more than simply visit the site, and your browser will remember the state. (This is a function of your own browser settings on your computer or phone, and is nothing over which we have any control.)
It is safe to simply stay logged in. There is no need to explicitly log out. That way, the next time you visit, you’ll already be logged in.
If you have lost or cannot remember your password, you can reset it. Go ahead and try to log into “My Account”  and on the log-in screen, look for “Password Reset”.  Click on that button, and enter your email address. It MUST be the same email address you used when you signed up.
You will be emailed a special link that will allow you to put in a new password. Please record your new password somewhere.