When you put some URL and email address you need to manually add the link URL to that text. This action always takes the some time of wordpress blogger. WordPress has facility to add the links to your URL and email address automatically.
This facility is available in wordpress since wordpress 2.7 version but many wordpress theme and plugin developers never used this functionality.
WordPress provides the make_clickable() function for convert plain text URI to HTML links. This function able to convert URI, www, ftp, and email addresses. Finishes by fixing links within links. You just need to pass the string parameter to this method.
More detail information you can find in following file.
You can use this method in your functions.php file also. Use the following code.
By using this code you are able to covert the URI, www, ftp, and email addresses in to link.
If you are having any issues or question about make_clickable method then please write to me.