Update app.py

app.py

@@ -209,7 +209,7 @@ start_annotating = """<h2>How to use the annotation interface?</h2>
 <div class="content-box">
     <ol>
         <li>
-            Open the sidebar by clicking the arrow in the upper right corner.
+            Open the sidebar by clicking the arrow in the upper left corner.
         </li>
         <li>
             Enter the participant ID you received via email.