To restrict a page, edit the relevant page and click the SECURITY tab as indicated below:
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To restrict access, click the Page Privacy by Member Status drop down and select the type of protection you require.
If you have set up Member Groups in the MEMBERS area, and have assigned members to them, you can also choose to restrict to a Member Group and other settings via the Page Privacy by Member Group option.
To give a user access to a password protected page, then you will need to create the member in the MEMBERS area,
Click the main MEMBER menu button, then choose Add Member from the options available.
If the user already exists, and you have restricted by Authorisation Level - then you need to select them and increase their security level to "Authorised User".
You can choose other access levels as appropriate. They must be higher than the security level set for the page. You can increase the password protection level for any page under page options tab, top right when editing page.
If you have restricted the page by Member Group, you will need to assign them to the relevant Member Group options. These can be found under the NEW GROUPS section on the right-hand side of the member record.