Some question about Cobalt and Emerald

Need a help from the expert for the following issues:

1. I'm trying to change articel author (user id) via front end/back end, when I choose select user it said "you are not allow to view this pages", I'm using user admin.

2. What is this use for and how do I find the setting (in red)

3. I have set to protect some field with subscription, and this is what we have for non subsc user, can we change it to a word like "Protected" with the links to subcription page.

4. I have set filter in section to 'records of all section', so I can filter on root level, this works fine. but when I go to sub level and use the filter it show all articel from all level not only for a sub level.

For ex:

COMPANY at this level, filter working fine can show all articel - AGENT at this level, filter show all articel from COMPANY level, it

                    supposed to show only for AGENT level.

- BANK - SERVICE