[SilentSoul]

It's not working because the player pAdmin enum is default '0' you did it right but you'll need to set the enum of admin to 1+ in order to use any command checking if the enum bigger than '0' ,

pawn Код:

CMD:makemeadmin(playerid,params[])
{
    PlayerInfo[playerid][pAdmin] =1;//So now you're allowed to use any command checking the admin enum.
    return 1;
}

The above was just an example you'll need to create a command to set admin level for players.