I am not able to delete tasks or to change the permission in the settings to do so.
Any help ?
Please check out the permission scheme of your project. You must have the "Delete Issue" permission in order to be able to delete an issue (or a task).
Please check this knowledgebase for more details about managing the project permissions : https://support.atlassian.com/jira-cloud-administration/docs/manage-project-permissions/
Another alternative is instead of deleting the issue, you can have status like "Canceled". If an issue is not required, you can move it to the "Canceled" status. This approach helps in preserving the history of the issue.
If you do not have the administrative rights, you may have to ask one of your administrators to check the permissions.
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