Use the Resources tab on the Task Information dialog box to enter, review, or change resource assignments and assignment units for the selected task.
Dialog box location
In any task view, click the task and then click Task Information 
Details
General task information
Name Shows the name of the selected task. You can enter another task name in the Name box to change it.
Duration Specifies the amount of time needed to complete the selected task. You can enter duration in minutes, hours, days, weeks, or months. To enter an estimated duration, type a question mark after the duration unit, or select the Estimated check box.
Estimated Specifies that the selected task has an estimated or tentative duration. Estimated durations are indicated by a question mark (?) after the time unit in a duration field.
Resources table
Resource Name Enter the name of a resource you want to assign to the task. Enter the name of only one resource per row. You can replace one resource assignment with another. You can also delete a resource assignment by clicking the row and then pressing DELETE.
Assignment Owner When you assign work to a team, use this setting to specify another resource to manage the assignments.
Request/Demand When preparing projects for resource substitution, specify whether the selected resource must do the task or whether any resource with the required skills can do the task.
Units Type the number of assignment units that you are allocating to the task. For example, to assign a work resource to work half-time on a task, type 50%. The default for assignment units is the same as the resource's maximum units, up to 100 percent. That is:
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If a resource's maximum units is set to 100 percent, the default assignment units setting is 100 percent.
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If a resource's maximum units is set to 50 percent, the default assignment units setting is 50 percent.
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If a resource's maximum units is 300 percent, the default assignment units setting is still 100 percent.
Cost When you add a resource to this Resources table, the computed cost associated with that resource does not immediately appear in the Cost column. However, if you close the dialog box and then re-open it, the cost info will then appear in the table. For related information, see Enter costs for resources.
To assign a material resource to a task, type the quantity of material to be used. The unit of measurement label (tons, boxes, yards, and so on) that you used to define the material resource appears in the Units field, and the default is 1.
Note: By default, your project is set up to automatically add new resources as you're making assignments. In other words, if you're working on the Resources tab of the Task Information dialog box, and you want to assign a new resource that isn't already identified in the resource pool, you can simply type the resource name.
You can change this setting. On the Tools menu, click Options, and then click the General tab. Clear the Automatically add new resources and tasks check box. If you change this setting and you want to assign a new resource on the Resources tab of the Task Information dialog box, you can still type the resource name, but then Microsoft Office Project prompts you to confirm the new resource when you close the tab or click OK.
