This is just a basic tutorial for converting .txt to EPUB. I'm not an expert and I have very little experience using these programs.
Name the file what you want it to be. If you have several chapters to a story use A.F.5. Load all the files into the program and change the left (none) to string and enter the name of the file. Change the second (none) to string and put a space, unless you put a space at the end of the name you gave the file. Change the third (none) to counter. It will show 01 – 99 then hit rename. That should be it for naming the file.
Example of what is should look like, if there is a space at the end of the name in the first slot move the counter to the second spot. string - string - counter new name 01-99
Next is putting the file or files in EPUB format. Start up ecub and start a new project. fill in the required spaces that have a *. Hit next after you filled what you want The project folder is where you put the files that are going to be part of the final file. Hit next. I just left it on the, from existing text or HTML it came out okay on this. if you leave the, take title from first line of each file. the first line will be used as a chapter name, so you should make the first line a chapter number. Hit next. I left this page the way it was by default. Hit next. On this screen is all the files in the project folder. if the files aren't in the same encoding you can use UTFCast to change all the files with the wrong encoding to the correct encoding, direction will be below. Hit next if the files are what you want. You can leave the, use an existing file blank if you want. I did that and it came out okay. Hit next. If you go to edit and go to files you can add a cover image. I don;t know what most of the buttons do. Hit compile to create the EPUB file in the project folder.
UTFCast Browse to a source directory to get the files from, likely the project folder. Browse to a target directory to send the converted files to. Hit start and the files will be sent to the target directory.