The screenshot you provided is for "pcruz" but not for you. Are you trying to get this to work with your profile or the other user's profile?
The three roles I mentioned are specifically defined / assigned in the BPC Web Admin client. You should be able to find this at a path that looks similar to this:
http://[Server]:[Port]/sap/bpc/web/
This is where you would go to assign those rights:
Do you have a Basis team that helped with the software installation, or was this all done by the team that has been fired? If you have a Basis team that assisted with this, then they might be able to help you with the security piece as well as telling you what the URL is for your BPC Web Admin client.
Jeff