Dear @volkan,
the csv chart is structured like this:
row 1 header
row 2 col 1 and 2 lon lat of your ref point
row 2 col 3 NaN to fill this cell
row 2 col 4:ncol the dates in days from 0 of the measurement, will be converted in stamps visualizer in yyyy-mm-dd
row 3 col 1 an 2 lon lat of measurement point (MP)
row 3 col 3 mean velocity of MP
row 3 col 4:ncol displacement value of MP
Therefore, the number of MP defines the numbers of rows and the number of images or interferograms to be more precise defines the number of columns. Your have selected two MP and less interferograms, therefore your table looks smaller than mine.
The number of MPs is defined by your ts-plot in matlab. The location where you put your point of interest and the size of the search radius define your number of MPs. Hence this is individual to each data set, I can not give you any further advice. To get more MPs processed in StaMPS, check out the StaMPS parameters by reading the manual provided on the StaMPS web page.
Setting a ref point is a global operation, the ref point information is used in several operations. I recommend putting this parameter before starting processing at all. To select a ref point it is highly recommended to use a location where you are sure or assume no or just minor movement/displacement. For further details, you will find help in the manual.
Beside the manual, I found a lot of help studying this paper: Hooper, A., P. Segall, and H. Zebker, Persistent scatterer InSAR for crustal deformation analysis, with application to Volcan Alcedo, Gal ´ apagos, ´ J. Geophys. Res., 112(B07407), doi:10.1029/2006JB004763, 2007.
Cheers!