How to know if I have a company account or personal account

Liz,

When you login to your myTI account, if you have access to a company account you will see an additional option to allow you to change accounts (see the difference between the first example and the second example below).  

To register a company account go here.   Once you create the company account you will need to add your personal account as a member under the company account  (Company account --> Under "Account Settings -->Manage your team -->Invite team members).  This will allow you to toggle between your personal account (placing orders that only you can see) and the company account (placing orders that all members, connected to the company account,  can see). 

Hope this helps  Let me know if you have any other questions.