An issue's priority is its importance in relation to other issues. JIRA ships with a set of default priorities. You can modify these or add your own as follows. 
Defining a new priority- Log in as a user with the JIRA Administrators global permission.
- Select Administration > Issues > Priorities to open the View Priorities page, which lists the currently-defined priorities and the Add New Priority form below.
Keyboard shortcut: g + g + start typing priorities  - Complete the Add New Priority form towards the end of the page:
- Name — specify a word or two to describe your new priority. (This name will appear in the dropdown field when a user creates or edits an issue).
- Description — add a sentence or two to describe when this priority should be used.
- Icon URL — supply the path of a image that has been placed somewhere inside
<jira-application-dir>/images/icons of your JIRA Installation Directory or from an accessible URL.
 - Priority Color — specify a colour to represent this priority. You can either type the HTML colour code, or click the box at the right of the field to select from a colour chart.
- Click the Add button.
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Editing a priority
- Go to the View Priorities page as described in Adding a priority (above).
- Click the Edit link (in the Operations) column corresponding to the priority you wish to edit.
- Update the fields as described under Defining a new priority (above), then click the Update button.

Re-ordering priorities
Re-ordering priorities changes the order in which they appear in the drop-down list when a user creates or edits an issue.
- Go to the View Priorities page as described in Adding a priority (above).
- To re-order the priorities, click the arrows in the Order column:
- Click the up-arrow to move a priority higher up in the list.
- Click the down-arrow to move a priority lower down in the list.
Translating priorities
To translate your priorities into another language, please see Translating Resolutions, Priorities, Statuses and Issue Types.
Deleting a priority
- Go to the View Priorities page as described in steps 1-4 of Adding a priority (above).
- Click the Delete link (in the Operations column) corresponding to the priority you wish to delete.