Currently, your account can only have an admin login. However, among the new features that will be coming out in the future will be a new multi-user management system, complete with different roles and permissions.
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.yourcompagny.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!