Submitting your documents to Squirrel Street is still exactly the same as it was before, except that the web uploader has changed slightly.
For more information on submitting documents by any other method, please follow this link.
The Upload Documents button is in a similar place to where it was before in your account, except that the uploader now a pop-up, rather than another page altogether
Simply drag your files over the page and drop them there, and they'll upload automatically!
To print a coversheet, go to Settings > Manage Envelopes > click on 'Send your own envelope' then 'Print coversheet':