Configure Issues
Open your project.
On the Projects sidebar, choose Issues.
On the Issues page, click the Settings button:
Add and edit issue statuses
Status represents the issue's current stage in its lifecycle. There are four predefined statuses:
Open: the work on the issue hasn't started.
In progress: the assignee is working on resolving the issue.
Done: the issue has been resolved.
Backlog: the issue is of low priority and can be set aside.
Statuses can be of two types: resolved or unresolved:
You can create additional custom statuses or edit the existing ones.
To add a new status:
On the Issue Setting page, click Add status.
Type in the status Name, choose its Type and the indicator color:
Click Done to save the new status.
To Edit a status, click and edit its properties.
To Delete a status, click 
next to it.