Free extensions for Joomla!

Hello everyone,
in my blog developed with technology Myblog (http://www.azrul.com), I have 2 bloggers who take turns writing the articles.
In the HTML generated by Xmap Sitemap appears only link to the user who first began to write.
The link does not appear in the second blogger, but all posts are under the name of the first blogger.
But in the XML Sitemap is the link to both bloggers.
In addition there is the possibility to put the titles of the posts in time order?
Can you help me, please?

Thanks

Hi, please try upgrading to the latest version of Xmap 1.2.6 or download and install the latest version of MyBlog's extension from:

http://joomla.vargas.co.cr/en/downloads ... -joomla-15

Perfect now correctly displays the two different bloggers.
I have seen, however, that the last modification date for every blog post appears to be 1970-01-01T00:33:30Z.
Can we do somethings? Are there some solutions?

Thanks