Thank you for
reaching out on the community and telling us about your issue. I do apologize for the issues you're having. To add transactions on the web application there's a blue + in the top right of the page that will let you add manual transactions.
From here you'll be able to add a new transaction for you to fill out manually. You'll then want to sync it so it transfers over to the desktop application. Please let me know if this helps you out.