Please help me fix the button code in My android app

Please made the button working , search button ,back and foward button .
please made this button work on same chapter : when user click a link
on chapter 1 its can go back and foward url that
been stored in the chapter 1
also made search button working can search all the word in chapter 1

So all the chapter in app can go and foward the url link store in webview