I have a dot .tk domain site where i have used wordpress content management system. But, the problem is that when i am searching my domain name, google showing me nothing about my site. How can i add seo for my wordpress website so that it can be easily indexed by google in its search engine result pages?
Download and install the Yoast SEO plugin for your wordpress website and setup your keywords on each page. It will also automatically create a sitemap for you, which you need to submit to Google using their search console website.
Please note that it will take a day or two for it to be indexed by Google.
By the way, .tk domains are known for many scams etc. So, you will have a hard time promoting it. Even Facebook block it if you send it on a PRIVATE message. Get a proper domain, anything but a .TK / .XYZ should be okay.