As long as you have associated a proper Email ID along with your deleted Tonido account, you can recover your account name when you reinstall Tonido.
To recover an old account when you reinstall Tonido, click on “New Account” and choose “Recover Account”.
You will get a recovery code via email, paste that recovery code into the recovery code text box to recover your account.
Once after you give Submit, the Tonido will automatically fill your Name and Email ID you can recover your account by setting a password for it.