To change company name, company address, language or password you have to access your account settings.
Click on the gear icon on the top right of your screen and select Account.
From here you can edit the following:
Company name and company address
To edit your company's name and address click on Edit profile.
In this area you can make your desired changes. Once you are done click on Save.
This changes the language for everything you see on the entire platform.
To change your password, type in you current password in the upper field and your new password in the 2 field below that. Finally, click on Change password.