When you click on the "Link it" the user will get an AJAX-Window appear, with 3 simple codes. Normal Link (URL Address), Link as BB-Code and Link as HTML-Code.
1. Go to your Control Panel.
2. Now go to Design Customization -> Site News (this script works for other modules too) -> Page with entry full text and its comments.
3. Now add the following code (inside the address below) after the '$MESSAGE$' tag:
Code
<br>
<center><form><a href="javascript://" onclick="new _uWnd('myName','Link it',500,200,{min:1,shadow:1,header:1,max:1,resize:0,icon:'/icon/16/link1.png'},'<strong>Link:</strong><textarea onclick=\'select(this)\' name=\'dest_text\' cols=\'80\' rows=\'1\' style=\'\'>$ENTRY_URL$</textarea><br><strong>BB-Code:</strong><textarea onclick=\'select(this)\' name=\'textarea2\' cols=\'80\' rows=\'1\' style=\'\'>[url=$ENTRY_URL$]$ENTRY_TITLE$[/url]</textarea><br><strong>HTML-Code:</strong><textarea onclick=\'select(this)\' name=\'textarea2\' cols=\'80\' rows=\'1\' style=\'\'><a href=\'$ENTRY_URL$\'>$ENTRY_TITLE$</a></textarea><br><br><small>This script was created by http://www.elliottmangham.com/<;/small>');"><input value="Link it" onclick="confirmClose()" type="button"></a></form></center>