You cannot programmatically set the location of signature fields using X, Y coordinates, such as DocuSign. I had the same problem and emailed EchoSign, and they instead told me that you need to use text tags for field names.
Documentation: http://secure.echosign.com/doc/TextFormsTutorial.pdf
So, for example, to put the signature field in the document, name the field {{_es_:signer:signature}} , and EchoSign will replace it with the signature field.
It should be noted that if you do not place them in a document, EchoSign will automatically add a signature field to the end of your document.
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