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Not there? Two possibilities:
The subscribe form requires that Javascript be enabled. If you run an add-on like NoScript in Firefox, or have some other Javascript-blocking software then that could easily prevent the form from being shown. Create an exception or otherwise enable Javascript on heroicstories.org and it should appear.
We’ve also heard of security software and privacy software that for various reasons blocks the “aweber.com” domain. That’s our mailing list provider, and that’s where the subscribe form comes from. Be sure that your security software isn’t blocking “aweber.com”. (And for the record, we believe strongly that the tools that block Aweber are simply wrong. See our privacy statement.)