Members or staff: how do i Mask a directory in the url without renaming it.

Staff, please leave this unanswered if you do not know the answer. At least as long as you can.

I am looking for how to do this using htaccess.
If someone knows a simple solution to this please let me know... Or if it is harder i dont mind paying for help I posted this on the jobs board just in case
https://premium.wpmudev.org/wpmu-jobs/project/use-htaccess-to-mask-the-wp-admin-url/