Yes, you can give yourself back the 15 stat points (5 each for level 2, 3 and 4) that you lost.
What are you having trouble with? There is a description of how to use the program on the page I linked to, but if you let me know where you are having a problem, I can go into more detail.
Basically, you need to download the editor and extract the zip file
somewhere, then run the DDSaveEdit.exe program. Next, click the '...' button at the top right (by the 'Save File' text box), browse to the DD savegames folder, and then in your latest save select the data.000 file and open it. Next, click on 'Redistribute Points', then in the 'Free Points' box just above there, type in 15 (if you are still on level 4) and then click 'Save'. Once you re-load that save game your stat points will be back, and you can distribute them.