On the project page, the Add form button is located under the project name and description.
The add form modal will open, and you can select the method of adding your form. There are three ways to add XLSForms to a project in Ona:
For forms saved on your computer, upload them directly by clicking on the Choose file to upload button.
For XLSForms hosted at an external url, paste the url into the window and click the Add form button.
If you are using Google Spreadsheet to edit your XLSForm, follow the steps below to get a downloadable URL that you can use to publish your form.
To retrieve the XLSForm downloadable URL:
If you have forms saved in a Dropbox account, you can upload them directly from Dropbox using the Select Dropbox XLSForm option.