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The yellow Sign Up button is used to create new households to add to waiting lists, and other interactions. (Creating a New Household for more info)
Re-certification Widget:
Households appearing in this area are about to be, if not already, due for re-certification. This widget keeps a count of up-to-date numbers of households on the re-certification list, allows to to choose the span of how soon households have due dates coming up, and an individual count of days for each household.