The ability to edit templates depends on your permissions.
There are several ways for editing a Template
Editing a Template from the Create / Edit Issue dialog - allows you to edit a Template in a quick way, from Create Issue Dialog, Create Sub-task Dialog, and Edit Issue Dialog.
2. Editing a Template from the Manage Templates page - allows you to edit a Template, from the Manage Template page, that helps you view and change all the available Templates in a quick way.
3. Editing the Template from the Node dialog opened from the Create/Edit Hierarchy page after selecting the template
The steps to make changes are the same:
Make some changes in the issue fields you need.
Click the ‘Update Template’ button at the footer of the dialog.
Make the needed changes in the template details.
Click the ‘Update’ button.
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