You must have either Mnemonic Phrases, or Private Keys or KeyStore at hand to import that account. Different wallets may use different modules to generate Mnemonic phrases. So when using Mnemonic to import an account, there's some possibility that you get a totally different account. In this way, private key is a recommended way to import an account.
1. click the wallet management button on the upright corner on the Asset page.
2. Select among Private Key, Mnemonic or KeyStore. Don't choose Watch Wallet here, since by importing a watch wallet, it means you can only monitor the asset on that account, but you don't own it and can not transfer it.
3. Input the credentials that you have, then set up a new account name and password. It will be done. Please do remember your PASSWORD. TronLink is a decentralized wallet, and we can't help users to retrieve password for users.