On all our sites, renewing an already-expired subscription is easy!
On CF, your old login information will be purged from the system so you can simply use your e-mail address to create a new account and subscription.
On BCF and on HCF, the website will recognize your e-mail address as being in the system when you enter it on the join/enroll page. You'll be prompted to login using your existing account and credentials, and from that point can initiate a new paid subscription. You'll also be able to reset your password during this process if you don't remember it.