Need advice on a form i am making on a website : 
		  <p><strong>Would you like to receive the Stay Safe newsletter</strong>
		  		 <select name="newsletter"><!-- dropdown box allows user to select if they want to receive newsletter-->
    <option value="yes">Yes</option>
    <option value="no">No</option>
			  </select></p>  
<p><textarea name="message" id="address" placeholder="Address"></textarea></p> 
		  <p><input type="email" name="email" placeholder="Valid email"></p>
		<button class="smallButton" type="submit" >Send</button><!-- submission button to send the form-->
	   </form>

I need help with coding my form what i want it to do is only show 
	  </select></p>  
<p><textarea name="message" id="address" placeholder="Address"></textarea></p> 
		  <p><input type="email" name="email" placeholder="Valid email"></p>
		<button class="smallButton" type="submit" >Send</button><!-- submission button to send the form-->
	   </form>
based on them selecting yes in the drop down box but unsure how to do this any help would be greatly appreciated 