Display the field list, if it is not already displayed: View > Field List
Drag a field from the field list, and drop it onto your report.

You may need to first create the appropriate Group Header and Footer for the
field in question, or perhaps just display a group Footer if the appropriate
Group Header is already shown. For example, if your report is currently
grouped by accounts, but you do not see a corresponding group footer for
accounts, then you will need to add one. To do this, click on View > Sorting
and Grouping in report design view.

You can add an unbound text box (ie. a text box that has no field specified
as it's Control Source) to the Accounts footer section. One way of doing this
is to first display your tool box, if it is not already displayed: View >
Toolbox. Your toolbox may be free floating, or it may be docked. Hover over
the various controls indicated in your toolbox, until you see a tool tip that
indicates Text box (ab|). Drag a text box to the Accounts footer section. Set
it's control source to an expression that involves the appropriate field name
that displays numeric data:

   =Sum([FieldName])

where you substitute FieldName above with the actual name of your field.

Here is an overview on creating reports (45-55 minutes) that you might find
helpful:

   http://office.microsoft.com/training/training.aspx?AssetID=RC010780631033


Tom Wickerath
Microsoft Access MVP
https://mvp.support.microsoft.com/profile/Tom
http://www.access.qbuilt.com/html/expert_contributors.html
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