A domain is the address; hosting holds the website files. Keeping your registrar does not prevent connecting separate hosting. Identify the authoritative DNS manager and save existing records before changing them. Ask the team for the exact values for your active service; do not use an IP copied from an example. Change only the required records. Preserve MX and other email settings when no mail migration is intended. Then check the exact hostname and HTTPS. Caches and TTL can delay visible changes; there is no universal guaranteed interval. A registrar transfer is different from connecting DNS.
