Lab 3b

I'm not sure how to log into Riley's account instead of mine on salesforce, and make edits on salesforce through her account. I am not sure where the reset password email is being sent to. I have access to the gmail I made for the salesforce lab initially, and I have my log in and password for the salesforce, but they are not the same as the one that it says on salesforce itself as my username. So i just don't know where I am supposed to get the reset password to go ahead and log in as Riley.