Private store does not allow access to Forgot password page or contact us page. Replace the pages in the zip file in the root of your website and App_code folder. Also you will need to add a new site term. This can be done by running this SQL against your db.

INSERT INTO [dbo].[bvc_SiteTerm] ([SiteTerm], [SiteTermValue]) VALUES (N'PrivateStoreNewUser', N'Need an account? Contact us.')

If you cannot run this against the database manually then go into the admin section of your site and go to Content > Site Terms. Then add a term with the name PrivateStoreNewUser and give it a value something similar to "Need an account? Contact us." This will become the text of the link to the contact us page.