Improve instructions

index.html

@@ -216,15 +216,22 @@ <h3>FAQ</h3>
           </p>
           <p>
             Then, include code like the following block. However, change the
-            value for 'src' to be your city's name and state.
+            value for "src" to the link to your specific city, which you can get
+            by clicking the link icon in the top-right corner of the map's
+            header bar.
           </p>
           <p>
             <code
               >&lt;iframe
               src="https://parkingreform.org/parking-lot-map/#parking-reform-map=salt-lake-city-ut"
-              width="100%" height="600px" &gt;&lt;/iframe&gt; ></code
+              width="100%" height="525px" &gt;&lt;/iframe&gt; ></code
             >
           </p>
+          <p>
+            You may want to adjust the "width" and "height" attributes. However,
+            we recommend not setting the height taller than "525px" because it
+            makes it hard to scroll on mobile.
+          </p>
         </dd>
       </dl>
       <h3>Acknowledgments</h3>