Hello Liz, and thank you for posting to our community!
I'm sorry to hear you are having trouble with your postage funds.
Your ShippingEasy account includes two free Endicia accounts, one to fund your First Class Domestic postage, and one to fund your First Class International and Expedited (Priority) postage.
If you are attempting to purchase an international or Priority Mail label, the postage will be drawn from the Expedited Endicia account, which will also need funds added, using the steps in the link below.
I hope that information helps.
Thank you and happy shipping!