diff --git a/app/templates/views/guidance/send-messages.html b/app/templates/views/guidance/send-messages.html
index 0587c80ac..2fc567a6d 100644
--- a/app/templates/views/guidance/send-messages.html
+++ b/app/templates/views/guidance/send-messages.html
@@ -16,7 +16,7 @@
 
   <p>To send a batch of messages at once:</p>
   <ol class="list list-number">
-    <li><a href="{{ url_for('.register') }}">Sign in to Notify</a>.</li>
+    <li><a href="{{ url_for('.sign_in') }}">Sign in to Notify</a>.</li>
     <li>Go to the <b class="govuk-!-font-weight-bold">Templates</b> page and choose an existing template.</li>
     <li>Select <b class="govuk-!-font-weight-bold">Send</b>.</li>
     <li>If you’re sending emails, select <b class="govuk-!-font-weight-bold">Upload a list of email addresses</b>. If you’re sending text messages, select <b class="govuk-!-font-weight-bold">Upload a list of phone numbers</b>. If you’re sending letters, select <b class="govuk-!-font-weight-bold">Upload a list of addresses</b>.</li>