If you have forgotten your BOS password, then you can reset it via the BOS home page https://www.onlinesurveys.ac.uk/

First, click the “Sign in” button on the top-right of the BOS home page

On the page that follows, click the “Forgotten Password” link

Then add your University email address and click the “Reset my password” button

Instructions for resetting your BOS password will then be sent to your University email account.