Hi Vijay,
In case you're still having difficulties with the My Home page: visit https://docs.moodle.org/29/en/Dashboard#Setting_the_default_Dashboard_for_new_users.
Access Administration > Site administration > Appearance > Default Dashboard page and then remove the Online Users block.
For your own user (admin, presumably), you may have to visit My Home and then hit the "Reset page to default" (after clicking "Customise this page").
Best,
Onno