Question for experts How can I change the links of Word Press postname.yoursiteweb.c0m I mean the article be like a subDomain exmple : avast-2012.youresite.c0m
Is your intention to do this for ALL articles? To the best of my knowledge, this cannot be done with one WordPress installation. If you're attempting this for SEO purposes and you're publishing a lot of articles, you'd be better off using the standard POSTs and using a plugin like "Yet Another Related Posts Plugin." If your intention is just to post a small handful of articles, you'll need to create a new subdomain and install a fresh WP for each subdomain. That will get very tedious and the articles won't be linked together in any meaningful way, so again... if SEO is your goal, keep them all in one installation, use posts and link the posts together with the above-mentioned plugin.
the most you can do is go to your cpanel and go to your Permalink settings and change 'em up there. otherwise you're going to have quite a bit of tedious work to do.