Hi Sunil - Welcome to the Community!
Changing statuses is based on the workflow. If you are on a board, you should be able to drag it to the next available status if it is in another column. If not, then you should be able to go directly to the card and change the status there.
For the "new" JIRA issue view you simply go to the status on the right side, click the drop down and select the transition to the desired status.
If you are in the "old" JIRA view, you should be able to click on the Workflow drop down and select the status.
I hope that helps!
Catch up with Atlassian Product Managers in our 2020 Demo Den round-up! From Advanced Roadmaps to Code in Jira to Next-Gen Workflows, check out the videos below to help up-level your work in the new ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events