You can save and load profiles from the Profile tab of the Options | Preferences menu item. Also, if you have written notes or chosen certain other options, when you choose to Quit, the program will ask you whether you wish to save your profile. A profile records Notes that you entered, and various other information about the state of the program, such as the style of Formatted Entries you prefer.
If you want stuff that you entered to be saved, you should save it in a profile with a name you can remember. You can ask Kirrkirr to autoload a profile at startup. Then it will remember your notes and preferences from one session to another, without you having to manually load a profile.
Note, however, that depending on how you are running Kirrkirr (i.e., what security privileges Java is running under), you may not be able to save profiles. If you are not allowed tosave profiles, you should just click No in the dialog box when asked ifyou wish to save a profile.