You have several options from the Mergent Online homepage. The primary two options are:
Additionally, you can:
Use the first search option available, the one that starts with "USA Company Database (Active)" as an option, to search for specific companies. The default options look through company databases of both U.S. and international public companies, both active and inactive. You can also add a private company database from D&B, but this is only necessary if the company you are looking up is a private company or you're not sure if it is. Remember, private companies will always have less information available on them when compared to public companies.
Once you start typing, a list of suggestions will appear. You can keep typing or click on a suggestion to view that company's profile.