I am a part of a group which all has the same boards. However, there is not a "button" or "link" on my boards that allows me to add a card to it. What could be wrong with my account? Our person considered the admin on the account wants everyone to be able to add a card to their boards so that everyone can see each other's boards and cards. Please explain what might be wrong. thanks
You may be a member of the 'Organisation' but not explicitly a member of the 'Board'. You can probably browse to the Board, but not make any changes, add cards, etc.
Once you are a 'member' or 'admin' of the Board, you'll be able to do all these things.
In summary, you need to be added to the individual boards as well as the organisation.