When needed to edit a particular company's details, you can access the company edit menu from the actions menu on the Company page, or from the actions menu in the company profile.
The edit popup will give you the possibility to change the following details of a company:
Primary domain
Aliases (edit, add, or remove). Learn about aliases.
Company name
Industry
Country and city
Tags: Create new tags, select existing tags, or remove assigned tags from a company. Learn about managing company tags.
When done, click the "Save" button and all the changes will be applied.