You cannot edit a scheduled remediation task, you will need to remove and create a new one, see the official documentation: Scheduling Remediation for Hosts, Virtual Machines, and Virtual Appliances
Scheduling Remediation for Hosts, Virtual Machines, and Virtual Appliances
You can schedule the remediation process of hosts, virtual machines, and virtual appliances by using the Remediate wizard.
You can schedule remediation for all hosts or all virtual machines in a container object from the vSphere inventory. You can perform scheduled orchestrated upgrades of the hosts or virtual machines in a selected container object.
To schedule remediation, you must specify a time for the remediation process on the Schedule page of the Remediate wizard.
vCenter Server uses the clock of the vCenter Server host machine for the tasks that you schedule. If you schedule to remediate an ESXi host that is in a different time zone from the vCenter Server instance, the scheduled time you see in the Scheduled Tasks, is the time of the vCenter Server time zone, and not time zone of the ESXi host. You can navigate to the Scheduled Tasks from the Monitor tab, under Task & Events tab.
You cannot edit existing scheduled remediation tasks. You can remove a scheduled remediation task and create a new one in its place.
If your vCenter Server system is connected to other vCenter Server by a common vCenter Single Sign-On domain, and you have installed and registered more than one Update Manager instance, you can create scheduled tasks for each vCenter Server instance. Scheduled tasks you create are specific only to the Update Manager instance you specify and are not propagated to the other instances in the group. From the navigation bar, you can specify an Update Manager instance by selecting the name of the vCenter Server system with which the Update Manager instance is registered.
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Richardson Porto
Senior Infrastructure Specialist
LinkedIn: http://linkedin.com/in/richardsonporto
