For the operations of the website, email and other services, you have to indicate the server addresses or enter the DNS records. The answers to the most frequent technical questions related to DNS management and data redirection are available at https://domains.lt/en/faq/for-technical-representatives-contacts/
Holding a domain and having a website are not the same. Besides the domain, the website also requires content and a server for uploading of this content – your own or provided as a hosting service. KTU IPC does not provide these services; it is only the registry of the .lt, .eu, .info, .com, .org, .net domains.