Press This is a bookmarklet built into WordPress, that allows you to grab bits of the web and post them easily to your blog. It’s wonderful!!! If you’re not already using it, find it in Admin > Tools;  drag-and-drop the link to your browser’s bookmarks bar, and you’l have a handy button for instant blogging without cut and paste.

The problem is that when I first used, it didn’t work. It gave me a 404 error everytime I clicked on the link. Doing some research on the Internet, I found many solutions that identified the problem but still didn’t work for me. Finally I found one that need.

Edit the below code, where it says DOMAINNAME and enter your domain name, and then copy and paste this code into the bookmarklet:

javascript:var%20d=document,w=window,e=w.getSelection,k=d.getSelection,x=d.selection,s=(e?e():(k)?k():(x?x.createRange().text:0)),f='http://www.DOMAINNAME.com/wp-admin/press-this.php',l=d.location,e=encodeURIComponent,g=f+'?u='+e(l.href.replace(/\//g,'\\/'))+'&t='+e(d.title)+'&s='+e(s)+'&v=2';function%20a(){if(!w.open(g,'t','toolbar=0,resizable=0,scrollbars=1,status=1,width=720,height=570')){l.href=g;}}setTimeout(a,0);void(0);

If this doesn’t work, try reading the original solution that worked for me. You can find it at:

http://blogmum.com/2009/08/how-to-fix-press-this-404-errors/

The below video explains how to test to see if you have the Apache Mod_Rewrite already setup to remove duplicate URLs:

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Here’s a great site on how to use Apache Mod_Rewrite to automatically rewrite your URLs so it always has “www” before the domain name. Without this, people can access the same content either by going to http://domainname.com/file.html or http://www.domainname.com/file.html which will dilute your linking for that URL. This site gives more information on the importance of it, but believe me it’s IMPORTANT!

http://www.thesitewizard.com/apache/redirect-domain-www-subdomain.shtml