Problems with chart legend

[Martijn]

hello,

I've got a problem concerning charts.

I've got a query called qryTechnicalReliability and in
this query there are 3 values.
These values are called Apr: Expr1, May: Expr 2 and Jun
Expr 3. The values are entered in the datafield of the
chart. When I finish the chart I'll get (in the Legend
field) a Line 1 text.
How can I alter this text in such a way that it is changed
to Technical Reliability?

Thanks,

Martijn