For certain pages I would like members to have to log in to access them. I need help in doing this. Can anyone here help me?

You can do this for the whole forum if you change the permissions of every forum so that Guests won't be able to see them and they will have to log in order to see the topics. You can change that from admin panel=>Forums=>Permissions=>Forum permissions control, click on every topic and make sure all the options(View the topic, Read the replies etc.) are unchecked for Guests.

I've set that. I need to be able to create members-only access to HTML pages.
Thanks for helping.

As far as I know you can't do that.

Ok, thank you.