If you want to access search feature of any website just through your address bar using " Search by Keyword " feature Just follow the Following Steps.
1st: Go to the webpage on the site where the search box is visible. Right Click on Search box and Select " Add a keyword for this search.. "
2nd: Fill in the bookmark creation dialog box with an appropriate bookmark name and keyword. Try to keep the keyword easy and short.
3rd: Now you can just go to address bar [ctrl+l or F6] type in your bookmark keyword followed by Space then search string
4th: Hit ENTER and you will get all the necessary required details.