If you've added team members to your Enji account, you can assign tasks to them. All you need to do is:
Click into the task you want to assign to them
On the detail screen that opens, select their name from the menu
This menu is under the task description and defaults to "unassigned"
Pro-tip: If you have a team member who is responsible for the tasks in a particular marketing channel, the easy way to assign them tasks is to:
Click into your marketing strategy under the Strategy tab
Scroll down to the marketing channels section of your strategy and click into the channel
Scroll to the task section in the detail view of the channel
Click into each task to assign it to your team member