In Guru, the password system is very straightforward:
To set your password, click on the small ‘Cog’ in the top right of every page and select ‘Download Settings’

This will bring you to the facility for setting your password details:

If you select to ‘Set/Change Password’, you can enter a password, confirmation and optional label.
Fill in your password - you will never need to share this password. It will only be used for documents that you download locally to your own computer. It should not be shared with administrators, external examiners or any other individuals.

All future sensitive documents such as exam papers will have this password applied upon download.