As others say, you do not need to do the 90 report, but they are still being accepted. I think the amnesty is extremely questionable myself, and I highly recommend not to have a brea in any 90 day reports or other "normal" activities, if at all possible.
You only do a 90 day report if you are on a one year extension of stay or equivalent visa; you do not do a 90 day report for being on amnesty.
If you already did a 90 day report in person, you can do the reports electronically through one of the following tools:
Immigration web-portal;
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Android eServices application;
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iPhone eServices application;
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