If you cannot file your return via the Tax Authorities' digital portal, there could be two reasons:
1. You applied for your VAT ID late. Did you apply for it at the end of the quarter? Then you must file your first return on paper. You will receive the forms by post and send them back to the Tax Authorities once completed.
2. You are too early. Great that you want to be on time, but you can only file your return after the first day of the new month. Example: quarter 3 runs from 1 July to 30 September. You can file your return from 1 to 30 October.