For your SimDif site you can get a free domain name ending in "simdif.com", buy your own domain name, or use one you already own.
Whether you use a simdif.com domain or buy your own, think about your brand or business name and your location first.
The easiest way to use an existing domain name with your SimDif site is to transfer it to YorName.
If you don't wish to transfer your domain name to YorName, for example because you have an email account with your existing provider,
If you have purchased your own domain name and linked it to your website, you can create a business email address like [email protected].