You can register .ro domains and every Romanian extension (.com.ro, .info.ro, .org.ro, .store.ro and more), plus international ones such as .com, .net, .org, .e...
It depends on the format expected by the form where you add the record. The symbol “@” usually represents the domain itself, without a subdomain. For a subdomain such as “shop.example.ro”, some forms require just “shop”, while others accept the full name.
Read the field instructions before saving: if the domain is appended automatically, entering the full name could accidentally create “shop.example.ro.example.ro”. After saving, check the resulting name in the record list. Do not assume that “@” works the same way in the name and destination fields; those fields serve different purposes.