Using the program is really easy. It is divided into two options. On the one hand we have the option to include only characters where you have to enter the number of characters you need, while on the other hand we have the option to include words, where you'll get a serie of words separated by blanks.
No matter the kind of password you need, PWGen will create a safe one. Don't forget to store it in a safe place because it is not easy to guess but neither to remember.