Yes, enter the information manually (provided you have it). Tip: Select any institution from drop-down list, enter anything for requested username, let it fail; auto-import will revert to manual entry screen.
But, make sure you have all latest information from your financial account; may want to call their tax center number or log in to their web site to make sure.
When entering manually, do so VERY SLOWLY; also, have a trusted other person come along and check your entries -- it's very easy to transpose numbers and not see them!