thanks for your response. The problem is that I don't have these code blocks in the authentication.tpl file. This is all there is :
{extends file='page.tpl'} {block name='page_title'} {l s='Log in to your account' d='Shop.Theme.Customeraccount'} {/block} {block name='page_content'} {block name='login_form_container'} <section class="login-form"> {render file='customer/_partials/login-form.tpl' ui=$login_form} </section> <hr/> {block name='display_after_login_form'} {hook h='displayCustomerLoginFormAfter'} {/block} <div class="no-account"> <a href="{$urls.pages.register}" data-link-action="display-register-form"> {l s='No account? Create one here' d='Shop.Theme.Customeraccount'} </a> </div> {/block} {/block}