@dzham thanks. I have tried but somehow I am doing something wrong. Below are the steps I executed in the Laboratory:
Goal: Send a authorize payment from one account to another
Operation 1: Payment Operation
Source account: GCJPJU6TQS36VGWAOVA6PHZF3ZE6MPPUJ63Q4HRNFSDLMFJVVIT4LDB7
Amount : 1333 XLM
After building the this transaction I get its hash: a2b1113033c2d8e1ce8efeaee59aba48ae6d72fd336aa3b16a6749fcde33fa62
Operation 2: Set Options:
Signer Type: Pre-athorized Transaction Hash
- Transaction hash: a2b1113033c2d8e1ce8efeaee59aba48ae6d72fd336aa3b16a6749fcde33fa62
- weight: 1
I then get the Tx envelope and submit it to horizon.
Then I get an error with a "tx_bad_auth" code. See here: https://screencast.com/t/V7TuIc0ZY3
Is there anything I am doing wrong here?