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If you upvote Qurators posts for higher Tier - the upvotes from this week will guarantee you higher Tier for the next week. So it is a weekly thing.
The subscription is valid for one month. It is payed monthly in advance.
And the delegation will guarantee you higher Tier until you undelegate.

Thanks. So my current Tier will lower at the end of the month unless I send more STEEM? I'm trying to get the hang of this as much as I can. :-)

If you are on a subscription base then yes. The start of the new month your tier will be lower. You can always climb to higher tiers via upvotes. If you have Discord, come chat with us and we will help you step by step to get the most out of Qurator Tiers =)