Can i upgrade for only one month or would i have to cancel it myself at a month. In the case of me canceling is it hard to do?
You could sign into your account and then go to https://flowlab.io/users/profile and click to cancel.
You COULD…but why would you want to…?
Anyway, if you watch the calendar you should be able to cancel on the last day of your plan month to avoid billing, I would imagine.