Campaigning lasts from the 4th-7th. Posts must be submitted within the calendar day (NZST) for it to count for that day (although there is 60 minutes' leeway in case you screw up).
Candidates have 2 posts each day to use in their ward (or city-wide in the case of the mayor). Each council ticket is allowed one post to use for a manifesto or similar post (you don't need a manifesto but it will get you better mods) and also allowed one post per race (if they do not have a candidate) to endorse another candidate.
Every post should be flaired ("North Harbour", "Tāmaki", "Counties Manukau" for each of the wards, "Mayoralty" for the mayoral race and "Manifesto" for manifestos). Endorsements should be flaired for the relevant race, though they should be clearly marked as endorsments.