When free trial period of 7 days has ended, the website that you created will not be available.
If you apply the basic plan during the trial period, you can continued publication and edit.
[Paid Services(automatic update every year )]
How to apply:
(1) Tap “Paid Services” at the Edit menu screen.
(2)Tap “Basic Plan”.
(4) Tap “Agree User Policy and Purchase Basic Plan”. Please input necessary information according to the explanation of the purchase screen.
Please refer also here