Password protect newsletters and database

Hi, This is my first post. I am in my late 60s, live on the outskirts of Sydney and taught myself to design websites for community groups 10 years ago using Serif Webplus. I have been using Webplus x6 but Serif no longer support password protected login so I cant have available my Probus Club newsletters, database of members and photos, and Minutes to members. On C Panel I have read that I can protect directories but Im not sure if I can protect just the relevant pages on my website. Im hoping that someone can assist me.