Currently, your account can only have an admin login. However, you can still give your clients direct access by providing them with your dashboard’s URL. Obviously, you can customize your URL with your own domain name if you want, like reports.yourcompany.com instead of dashthis.com.
If you want to give your client the dashboard’s URL, go to the dashboard’s menu (or the group’s menu, if you want to share an entire group), and choose the option Copy URL link. That’s it!