Have the live page determine if they're logged in and prevent the form until they do.

pages/live/index.html

@@ -23,6 +23,10 @@
       </table>
     </div>
 
+    <div class="flex flex-col"
+      x-data="{auth: false}"
+      x-init="auth = await GetJson('/api/authcheck')">
+      <template x-if="auth.is_authed">
         <form action="/api/link" method="POST">
           <card class="card">
             <top>Submit a Link</top>
@@ -36,6 +40,14 @@
             </bottom>
           </card>
         </form>
+      </template>
+
+      <template x-if="!auth.is_authed">
+        <aside>
+          <p><mark>Post Links</mark> You can post links after you <a href="/login/">Login</a>.  If you want an account simply <a href="/register/">Register</a>.</p>
+        </aside>
+      </template>
+    </div>
   </bar>
 </div>