HTML caching

Hi every one Im using Pagespeed caching proxy and I wish to cache the html also AS I was facing slow speed when I switched to Wanderers.

here is the help from Pagespeed:

Non-cacheable parts identify the portions of the page that are not cached on PSS servers. It is specified using id or class attributes in the HTML. For the configuration shown, any HTML tags with id="username" or class="price" won't be cached. Any content rendered via JavaScript doesn't need to be marked as non-cacheable

help me please.

thanks