Step 1) Visit the google coop link: Here
Step 2) Click on the custom search engine text
Step 3) Click create a custom search engine
Step 4) Now Log in to Gmail
Step 5) Fill In all the details in the Set up your search engine page
Step 6) Under the what do you want to search option select the ‘Only sites i select’ option and type in your website Link.
Step 6) Click the next button
Step 7) Hit Finish and now your search engine has been made!