Add a Wordpress Contact Form 7 forwarder to an existing form

I have a Contact Form 7 page and I would like to redirect to a thank you page upon submittal. Need someone to resolve this issue and tell how it was resolved. I tried the following but noting worked 1. I added the following line to the “Additional Settings” field of Contact Form 7 on_sent_ok: “[login to view URL](‘http://XYZ/thankyou/’);” 2. I added the following line to Contact Form 7 [login to view URL] .wpcf7 .wpcf7-mail-sent-ok {visibility:hidden;} 3. I changed the following line to Contact Form 7 [login to view URL] div.wpcf7-mail-sent-ok { } to display: none; 4. I added the following Plugin but it could not be installed Contact Form 7 Redirect 5. I added the following Plugin but it did not work Contact Form 7 - Success Page Redirects