How Can I protect a member's area folder on my site?

i have site working now, , member's area in folder, structured , linked in dreamweaver. i'm happy , if functions beautifully, question... member's area in folder needs protected members have access. is, no 1 knows address of folder area, once have access need keep location url in. means not protected being shared anyone, not want.
i change name of folder periodically, discourage theft, not real solution. have suggestions on how approach problem on simple level?. need make access simple people have permission , hidden people don't.

if 1 folder , want easy security, have @ https://www.addedbytes.com/blog/code/password-protect-a-directory-with-htaccess/

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