Help a newbie with websites?

Hi. I have been trying to get GoldenDict to look up words via websites.
For example, I go to a Babylon site and look up "cargar".
Then I copy the web page which reads: http://www.babylon.com/definition/cargar/English
Then I replace "cargar" in the string with "%GDWORD" so that it now reads
http://www.babylon.com/definition/%GDWORD/English
The result when I look for a word in GoldenDict is that Babylon looks up "%GDWORD" and finds nothing!
Can anyone tell me what I am doing wrong? Do I need to experiment with the suggested strings other than %GDWORD?
I have been trying the same or similar methods for other sites: GoldenDict usually opens the site for me, but the search box is always empty.
Thanks in advance.
For example, I go to a Babylon site and look up "cargar".
Then I copy the web page which reads: http://www.babylon.com/definition/cargar/English
Then I replace "cargar" in the string with "%GDWORD" so that it now reads
http://www.babylon.com/definition/%GDWORD/English
The result when I look for a word in GoldenDict is that Babylon looks up "%GDWORD" and finds nothing!
Can anyone tell me what I am doing wrong? Do I need to experiment with the suggested strings other than %GDWORD?
I have been trying the same or similar methods for other sites: GoldenDict usually opens the site for me, but the search box is always empty.
Thanks in advance.