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timed 6
You've got to be fucking kidding me. xD Start learning very basic programming first, it's kind of a necessity before even considering the timed challenges. So no, this is not what is meant by "posting back". :P
With the timed challenges, you're supposed to code a script that reads the challenge, solves it and sends a (in this case) HTTP POST request with the answer, within a few seconds. ;)
No, you haven't posted to begin with. GTA and stealth would have done what's considered as post back.
You can POST to that page with the timed challenge though.