Open the report in design mode. Click on 'Field list' in a menu bar. A list of
all the fields in the query the report is based on should appear. Click on the
one you want to add and drag it to where you want it to be in the report.
If the query was made after the report was designed, then what is the record
source for the report? My last post will not work if the record source for the
report is not the query. The field you want to add must be available in the
record source for the report.