To register a .sm domain name it is always mandatory to contact an Authorized Reseller, which will support you for any kind of matter concerning the domain name itself (price, renewal, specific documentation, modify of Owner Data,
deletion, etc ...).
If you don't choose an Authorized Reseller you will be automatically assigned to TIM San Marino S.p.A..
The whole instructions on this web site are independent from the Reseller you choose.
List of Authorized Resellers