In your data table, select the column you want to show the label for and select 'Label/Unlabel'. You could create a custom column here to bring multiple values together in a formatted string, like 'Point 7 (123.4 lb)'.
Next select the rows you want to label and right click on a row header and select 'Label/Unlabel'.
Now redraw your graph and you should see only the blue points labeled: