Changing the Title of your Homepage is extremely simple, Gohar.
To do so, go to Dashboard → Site Settings and change the Site Name from the appropriate field.
I'd also suggest to make use of our SEO App to change the Meta-title for your Home. Simply select the settings of the homepage and update the Title subsequently.
Please be aware that the following in-built app also gives you an option to set the SEO tags for improving your search engine ranking.