Admin->Pages->Add Page-> In keywords field you can add any link, for example: http://www.google.com

If you need quotes in URL, for example when calling api methods with json, then you should replace quote with %22, example on image:

NOTE: in script v1.5.9 and above this replace is not required anymore.

For classifieds script you can take link as on this example:

 search={"v_search_option_79":"example value"}

If you will add complete link including http://www.geniuscript.com/class…; then other page will be opened depend on link, so be careful.