Hello @itorres​,
My name is Henry and I am happy to assist with your inquiry, and appreciate you contacting LastPass Support!
Each user account has its own Master Password, this is the password they use to log into their LastPass account. If one of your users can't remember the Master Password of their account, they will need to follow account recovery.
Please let me know if this worked or if further assistance is required.
Thank you,
Henry | Customer Care