When you first create your contractor account, you will have the option to choose a type Individual or Entity.
You can always change your contractor account type, in a few clicks:
Go to the homepage & click on profile icon and then 'Profile settings'
Under Contractor type change select Entity
Enter the entity information and Save
The information that you enter here is what will be applied to your contract and to you invoices
After you change a contractor account type, your information on active contract will remain the same. The new information will only be applied to new & pending contracts