Painfully easy question about "Tasks" template in Access 2007

[ldm125]

I'm trying to make a product for my job, and it turns out that the "Tasks" template in Access '07 was perfect. The problem is that I can't seem to figure out how to assign a task to more than one party. I'll fill in "Task Title", and then who it's assigned to. But if the task is to be assigned to more than one person, it says "The text you entered isn't on the list" and asks me to edit the "list" (i.e. contacts list).

So put simply, how do I add more than one? I've included a screenshot for simplicity.

[June7]

Far as I can tell, Tasks table is set up to allow only one Contact per Task. AssignedTo field is not set up as a multi-value field.

[ldm125]

I was afraid of that. I appreciate the help though... I'm not exactly "proficient" in Access yet. haha