If you forget your password, simply go to your chapter's login page and click the link under the login box.  

Here is what it will look like:

Enter your email address associated with MCR and click "Send Password Reset Link."

If you are unsure of how to get to your chapter's specific login page, you can also reset your password by going to https://login.mychapterroom.com and clicking the "forgot your password?" link under the login box.

An email will be sent to you with a link to reset your password.  Click the link to create a new password.  
The email will look similar to this one:

Once you set your password, you can get back to the login page by clicking the link.  Simply type in your email and new password and you are all set!

Mobile App: 
Your email and password for the mobile app is the same email and password you use for the website.  You cannot reset your password from the mobile app - it must be done via the website.