We have a backup of QB desktop version that we need to restore to QB Online. Tell us how to do it.

Here is a link to instructions on how to convert. http://support.qbo.intuit.com/support/answers.cfm?faq_id=6012

If you do not have QuickBooks installed, you can install your version or get a limited copy here: http://support.qbo.intuit.com/support/answers.cfm?faq_id=4665

Now, if for some reason you cannot do this, or if your file is in 2013 or 2014 version, contact Intuit QuickBooks so they can assist with it. Support is included! Go to http://intuitcar.es/contactquickbooksonline then click View Contact Options then Call.