manual missing from the website
The docs page says that there's a manual (and links to http://www.sac-home.org/doku.php?id=docs:main - http://www.sac-home.org/lib/exe/fetch.php?media=docs:manual.pdf for the PDF), but the links seem to be broken.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information