|| I have an eQSL account under my old callsign. Now I've got a new callsign. What should I do?
Do not continue to upload logs for the new callsign into your old account, because all those eQSLs will have the wrong callsign on them, and nobody will confirm those eQSLs when they receive them. Instead, go to My Profile -> My Other Accounts, and create an "attached account" for the new callsign. Then log into that account, set up its profile and eQSL design. Then upload the logs for that new callsign into the new account.