I apologise to everyone for not following.
Initially when I made my account (on 2011-11-18), I choose to keep my info private.
I made my first noble character, my profile was private and in the 'edit data' section I could stwich between a public profile and a private profile whenever I wanted.
Then I went on to make two more characters, one noble and one adventurer, and my profile was still private, but in the 'edit data' section, It said displayed "(locked at yes as long as you play more than 2 characters)" but I was still allowed to choose a yes or a no.
When I made my profile public, by choosing a yes (as an answer to 'public info?'), the 'yes' got frozen, my account went public but I didn't get an additional character slot.
I believe the problem is that when someone has two or more characters, the user data must automatically lock 'public info?' at 'yes', rather than giving a choice, and I believe that when this happens, the game doesn't provide an additional character slot. A character slot I guess is provided only when someone chooses to make his profile public... I believe this is why I didn''t get a character slot. But I say, because of the bug, I did make the choice, I too choose to make my profile public, hence I think I deserve a character slot. 
Am I adviced to write a bug report on this? 
You don't get an additional character slot. Your noble limit changes to three. The total number of characters you can have will increase when you reach 20 fame points.
If you want to unlock one character slot+additional noble limit, you can donate.
So in total, you can have 5 nobles and 5 characters active.
When you start: 3 character slots, 2 nobles and 1 adv
-Public 'Yes': 3 character slots, 3 nobles
-20 fame points: 4 character slots, 4 nobles
-Donation: 5 character slots, 5 nobles
