If you have only password which was generated for you by the system and your account name created by you, it means that you have account model.
If you have any issues with login into your account, please try via Incognito mode in Google Chrome
Go to the OpenLedger DEX.io login page
Use your login-password pair to log in as an existing OpenLedger DEX user with the account model-based account.
All steps you can view in this small guide.