Not clear what you mean by, "series selection tab".
If you are trying add Category Name Labels to the Series points on a chart
do the following:-
- click anywhere in chart
- this will cause Chart Tools at top of screen to become enabled
- Layout / Data Labels / More Data Label Options
- Format Data Labels window should launch
You can make various changes in here to the series of points on the graph.
If my comments have helped please hit Yes.
Thanks.