If you believe there is an error/oversight in the specification then a mantis issue needs to be raised against the appropriate specification part:
When creating a Mantis account please use your real name as an account name so we know who submitted it.
When the UA WG addresses it they may have additional questions which will be added to the issue.
Mantis should automatically send you an email if this happens.
Note that if you don't respond to a feedback notification from Mantis your issue may not be addressed.
If it is a high priority issue then any member of the UA WG can add it to the agenda for the weekly call at 11AM ET.
You can do this editing the meeting for the day you would like to attend and add your name (important) + Mantis #.
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