From your main dashboard in Defense.com, click on your name, followed by Partners in the drop-down menu.
This will list all of your managed companies.
To the right of each company, you’ll see a people icon, click on this for the first managed company you wish to add users.
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This will take you to the Manage Access page.
Search for the user in the list and click on their name. They will be added to the box.
You can select multiple users from the list and they will be added to the box. Any users removed from the box will have their access removed.
Now you've added your users, click the Update Access button.
That's it! 🎉 You've now given your user access to manage your managed company.