How do I give another user access to my report?

When you create a new Report, you will be asked to assign it the User who is responsible for completing it.

You can also add Delegate Users in case you want more than one person to be assigned to that specific report.  

You can even assign specific chapters to different Users. Depending upon the permissions you have assigned to a particular User for the report, they may only be able to see that specific chapter, or the entire Report.