I forgot the password and I was not finding a way around it. So I discovered a procedure to clear the PLC program from Control Win. The softPLC data is stored in folder "C:\ProgramData\CODESYS\CODESYSControlWinV3x64\" (I am currently using v 3.5.17.10). Stop the PLC through its icon in the taskbar and then delete the content of the this folder. Now during the next login there will be no online program and it will ask for creating a new user again.