If you are a trial user and would like to continue hosting with your hosting provider, you must become a pay user. For this, all you need to do is to create a billing profile. If you don't do it during the trial period, upon its expiry your account will be suspended. This closes access to your control panel and redirects visitors to your site to a suspended account page. However suspending trial account preserves its content and configuration and still leaves you a chance to become a pay user:
If you do not become a pay user upon trial period expiration, your suspended account is likely to be completely deleted in a couple of days and then all your account settings will be lost.