When creating a task in the Tasks tab, you have the option to select Create task and send it later, in this case the task will not be sent to the freelancer. A task in the Created status can be edited.
If you choose the option Create task and send it to the freelancer, then editing the details in the task will not be possible. If such a need arises, move the task to the archive using the Move to archive button and create a new task.