The fact that people have completed on properties in your community means that it needs a president and administrator to run it.
In terms of your "president", the president cannot be self appointed. He or she must be voted in at an AGM or EGM.
In terms of communities where the developer still owns the majority of properties, the developer only gets one vote for all the properties it owns, and not one vote for each property. I'm pretty sure of that but you'd best download the horizontal property laws (right click and save the pdf to your PC) here and just check that to make certain.
With regards to the administrator, remember that he/she must also be voted in at the AGM. In the majority of cases the initial administrator is selected by the developer to attend the first meeting, but again, this can be approved on the day or not.
Not sure if any of that has been at all helpful
Justin