If you send a villain to do a task, it is a task that you have already completed. You can send a villain to complete it. After the task is completed, it will change from blue to yellow and gain influence. Click the yellow icon to get the item can.
If you send villains to the territory, you must first do the task to make the territory's influence more than 50%, then occupy the territory, and then send 0 to 8 villains to the territory. The higher the villain level, the more you send, and the slower your influence will be lost in the territory.