add tab explanation

_static/html/general_instruction.html

@@ -5,6 +5,8 @@
     <p style="text-align: left; font-size: 16px; color: #34495e; line-height: 1.6;">
       It is December 31, 2023. You are an investor exploring individual stocks and have come to consult a financial advisor for guidance. In this experiment, you’ll choose a stock from the available tabs and discuss its suitability with the advisor. If you encounter any unfamiliar financial concepts or need clarification, feel free to ask questions.
       <br><br>
+      <strong>Please select one stock from the 12 available candidates shown in the tabs above that you would like to discuss.</strong>
+      <br><br>
       Note: The candidate stock is <strong>randomly</strong> selected and is <strong>not a recommendation</strong> from the advisor.
       <br><br>
       To begin, click the <strong>Start Conversation</strong> button, type your message in the <strong>User Input</strong> box, and press <strong>Send This Message to Advisor</strong>. If the advisor’s response is truncated, click <strong>Show More of the Advisor’s Answer</strong> to continue.