CAN I BUY MORE THAN ONE TICKET WITH MY MEMBERSHIP?
In almost all circumstances the answer is no. One membership = one ticket. On a rare occasion a match that does not sell out will be opened to the Friends & Family sale which would allow for a member to purchase further tickets under that membership but you should not count on this happening as a game against Hull is as likely to sell out as one against Liverpool.
Hope that helps 
More info in that thread if you need it.