Check these details and Yahoo Small Business Domain Login Page information here. If you are a first time user you will need to register your account or create a new one, otherwise you can login on Yahoo Small Business Domain Page with your previous login details.
These results are more helpful for you as these are anti checked and also verified by the system. You just need to open the Login page links nd enter your Login details like Login Id and Password and submit the information.
If you face any issue in your Yahoo Small Business Domain page Login, you can contact us from our Contact Us Page.