1 - Submit Backlinks to Google Webmaster Tool -
Go to the official webpage of Google’s Webmaster Tool. Search for Google Webmaster Tool and visit their web page from there.
You will see the Search field on the main page. Make sure you copy and paste the URL with backlinks here in the given field.
Solve the Captcha code and click on Request Submit button.
2 - Ping the URLs -
If you find that the Google Webmaster Tool is not working and your backlinks are not indexed yet, then you need to Ping the URLs containing the backlinks.
This is nothing but a reminder to Google about the update of your webpage. Once you ask Google to check the update on your webpage, Google will check the requested webpages to see what’s new and legit on the requested page. If everything seems to be alright with Google’s policy, Google will quickly index those webpages.
3 - Make use of Social Networking Websites -
Make use of different types of social networking websites by sharing your webpages containing backlinks. More social sharing brings more traffic to your webpage and it lets Google know about it naturally. This is the most effective and the easiest way to let Google Index your websites.