
Hello @Rajiv Kumar ,
Welcome to Q&A Forum!
Please follow the steps:
1.Go to the subsite as a site admin
2.Settings gear >> Site settings
3.On the Site Settings page, click "Title, description, and logo" link
4.On the Title, Description, and Logo page, scroll to "Web Site Address" section to change the URL name
5.Wait for a few minutes to take effect
Thanks,
Echo Du
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