To sign up, just click on "Register" (right hand side of the top menu) and fill out the form. (If you check the "Brag" box they'll give you a shout out when you make a sale!
You cannot upload your manuscript to this site - that's not what it's for.
You can create a record for a manuscript you want to send out into the world to see if you can get it published.
When you submit the piece to a publisher or editor (for a magazine), you update the Submission Grinder record. When you've sent many pieces out, Submission Grinder will be an easy place to go to see what you have submitted, what has been sold, and if you want, you can mark a piece retired.
First, Log In to your Submission Grinder account.
Then
Open the Account drop down menu and select Manage Pieces.
Click on "Add Piece" from the top menu bar.
Fill out the form to provide information on the piece. As an example, I'll fill one in for a piece with the title of Freeing Hope.
Hit the Save Piece button when you have filled out the form.
From the list of pieces, choose "Run Search" to find markets for the piece you want to send out:
The system will bring up the search form, populated with the information on the piece.
You do need to fill out the appropriate minimum pay field. (Either Minimum Original Pay or Minimum Reprint Pay), and any other search criteria that you want to add. Then hit Search.