Hi Lucy
You have €3,000 in shares in a credit union on which you are probably earning 1% interest, or €30 a year.
Although, the CU won't give you a loan, they may allow you to withdraw up to €2,250 (75%) of this while retaining the €3,000 loan.
You should pay this off your credit card.
Your net savings will be €312 per year. (2,250 @14.9% -1%)
You should pay the minimum allowed off the credit union loan.
You should pay as much as possible off the Credit Card loan.
If the CU don't allow you to withdraw €2, 250, you should kick up a fuss and write to the board and attend and speak at the AGM as it's not acting in your best interests. See this
Key Post for advice on how to go about it.
If you have no success, then you should use your shares to pay off your CU account saving yourself €172.50 ( €3,000 @6.75% -1%)