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My answer wasn't very instructive.

I actually cover how to sign a transaction over in my last blog entry. As I was coding up a way for a server to verify a user without a third party and without sending the private key to the server. https://steemit.com/steemdev/@leprechaun/signing-messages-in-javascript-and-verifying-in-python. Look at the construction of the transaction itself. It is simply a json dictionary and one of the keys is operations. the operations is an array of operation name, and detail pairs. You want to replace the value of the operation key with transfers.

operations: [    pair1, pair2, pair3, ...   ]

where a pair is of the following form:

    [ 'transfer', transfer_dict ]

where a transfer_dict is of the following form:

{from: "freyman", to:"leprechaun", amount:"1 STEEM", memo:"thanks for the tip"}

Thank you very much again...
Your initial response was all that was good ...
The problem of the receiver is a hollow head, greater and with few studies.
Understood your comment ... thank you very much again ...
We'll see if we suddenly have another expert ;-) programmer at Steemit.
Thanks again.