Open your JIRA Cloud "Add-ons" administration page
Switch to "Find new add-ons" section
Find add-on by typing "agile estimate" in the "Search Marketplace" field
Click "Free trial" button on the "Agile Estimate" add-on
Accept installing the add-on after reading "Data Security & Privacy" information
Users can start using Agile Estimate add-on with Scrum boards immediately after add-on installation without any additional configuration.
Kanban boards require "Time tracking" issue field on Edit issue screens for projects which are part of a Kanban board.
When user changes time estimate of an issue on a Kanban board JIRA assumes/requires that "Original estimate" field can be edited via JIRA edit issue screen too. That's why you need to check if "Time tracking" field is part of Edit Issue screen.
If "Time Tracking" field is absent on "Edit Issue" screen then user will see an error message "Error updating issue estimate":
How to add "Time tracking" field to a screen
The easiest way to update your project edit issue screens is via "Project settings" → "Screens" tab:
Click on a screen for "Edit issue" and add "Time tracking" field to a screen if it is not yet there:
You should add "Time tracking" field to all issue types if they have different Issue Type Screen Schemes
Changing estimates on Kanban board should now work fine:
Agile Estimate add-on shows a selected sprint backlog in dialog where all sprint backlog items have estimation slider.
Moving slider left/right dynamically changes and saves estimation for that issue.
Total number of issues in sprint and total estimation of all stories is also available.
All estimations are visually represented in the estimation bar so that users have visual representation of the estimation size and can compare backlog stories with each other and adjust them easily.
Agile Estimate add-on supports boards with both Story and Hours estimation types.