I have not put in my credit card information
You are not required to input your credit card information to get access to the free trial.
If you don't put this information in, then you won't be charged. Additionally, you'll lose access to your account and any sites that were published will be taken down.
After the trail ends, if you choose to upgrade your account to paid, you will get access to your account again.
I have put in my credit card information
That's great! After the free trial expires, your billing cycle will begin, so you won't be charged until after the trail is over. You'll continue to have access to your account.