Installation of Application
Access the Atlassian Marketplace to install the App
Open your Jira or Confluence instance.
Click on the Settings gear icon in the top-right corner.
Select Manage apps under the Atlassian Marketplace section.
In the Find new apps tab, you will see a search bar at the top.
Type “Cost Estimator for Jira”
Click on the app to install from the search results.
On the app's page, click the Install button.
You may be prompted to log into your Atlassian account.
After clicking Install, the app will be automatically added to your Jira instance.