A Company is a CRM object holding data and the history of interaction with a company. A company is generally a large record in the CRM since it can contain several contacts and deals, and their histories.
Navigate to Home Feed and click on "a company" under "Add" section.
Enter the name of the company and its domain.
Click on "Let's Search".
Your company is added successfully.
To view the profile of your company navigate back to Home Feed and click on "all companies" under "View" section.
If you wish to add your company directly from company's list screen then click on "add a new company" and it will direct you to the screen shown in Step 2.