In order to add a new domain or subdomain on Protectumus for daily or weekly security checks, you first need to create an account. More details regarding the account creation can be found here: https://protectumus.com/kb/details/how-to-create-account.

Once you login to your account, you will see the Websites to protect area.

There's a text input called New Entry.

1) In order to add a domain, you must enter a valid domain name in the New Entry area. For example you can enter:

yourdomain.com

2) In order to add a sdomain, you must enter a valid domain name in the New Entry area. For example you can enter: subdomain.yourdomain.com