To reset your password you'll need to reset your ACM Gmail password.
We use single sign-on here at ACM, which means that your ACM Gmail account determines your password for other accounts such as Canvas.
1. Go to https://mail.google.com
2. Sign out of your Gmail account if necessary
3. Click 'Forgot password?'
4. Google will take you through steps to recover your password
Once you have changed or recovered your password here, you will be able to go to https://m.acm.ac.uk/ , click 'Student Log in', enter your username and new password, and view your myACM Dashboard.
From there, click on the Canvas icon in the myACM Dashboard.