When you have recorded a new group of data you may register a "label" or "key word" for that group, e.g. the number of a beewing to be measured or a questionable tree ring border.
To enter a label, first see that your data point is selected. Then click in the Point label text box and write your text.
(From version 7.8 the background of the text box will then turn light red to signal this "label input mode". Finally click the Enter key.
If you have several points within a group of data (group data mode), there is only one label saved for the whole group,
though you may enter it for any one of the points.
The labels will be written at the end of the lines in your data file, like
6,49 1,19 9,93 1,63 7,84 1,52 8,00 2,19 8,41 2,41 8,60 2,36 7,80 3,06 #No 1:
17,74 2,09 21,21 2,44 19,11 2,43 19,17 3,04 19,75 3,30 19,92 3,25 19,13 3,95 #No 2:
If you want to change a label, just select a point within the group, change the text in the Point label text box and press Enter on your keyboard.