A blog reader asked for visitor's registration. The only thing I can think about is either a Guestbook or a Shoutbox. I have written about Guestbook at Guestbook for your blog with an example at Natural Remedies. Clicking on the links in Guest will take your visitors away from your site (though you may chose to have the new site open in new window).
If you want visitors to remain on your site, you will have to install a Shoutbox. You can see an example of one at Medical Matters at the bottom of the right sidebar. Try leaving a message in that Shoutbox.
That Shoutbox was installed using Shoutmix. You will have to create an account, sign in, click
1. Get codes
2. Place Shoutbox on webpage
To see your work, click VIEW BLOG.
Find topics by using the Google custom search box above which can search multiple blogs, or the SEARCH BLOG in the left corner of navbar. You can also find topics in the Label List and Categrories in the right sidebar.
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Disclaimer: This blog has no relation with Wiley Publications