I recieeved a letter from my credit union that they had a good year and deposited money into my savings account that is taxable. Where do I put this amount in?

How much is the amount?  It sounds like a dividend or interest-related.  You might need to create a Form 1099-INT.  

I am attaching a post from our superuser jerry2000 who provides some good information on a related question.  Click here: Credit Union

To create a Form 1099-INT, in TurboTax online, here are the steps:

• Sign in to your account and select Pick up where you left off
• At upper right corner, in search box, type in 1099int then Enter 
• Select "Jump to 1099int " 
• Enter the amount as interest income