When you go through menu or sitemap to the page tagged "Page to change password", you get an error message :
"An error occurred while changing your password. Please try again later or contact the site administrator. - See more at: http://demo.ametys.org/en/your-account/change-my-password.html#sthash.jh5qC3ok.dpuf"

This page is correct with mode lostpassword (link "I forgot my password" from the user signup page)

This mode should be activated by default