If you already have a merchant account with SLI:
Go to the Engines page of your SingleFeed account and select SLI Systems. Provide your FTP username and password (provided by SLI), and the name of your feed file. We recommend using "yourstorenameSF.txt" to keep things simple. For example, if your store name is GreatGoods, enter greatgoodsSF.txt as the filename. SingleFeed already knows all the FTP information needed to deliver your feed file to SLI. Make sure the “Activate Engine” box is checked, and click the “Save Changes” button.