I finally converted the PDF files to both ePub and .mobi formats for your eReaders. As it turns out, it was a simple process. In fact, I found several online tools that require no software from me at all. It uploads the document to the server where it converts it to the mobile format, and then the download of the converted file is automatically started. It only took me a few minutes to convert all of the files I had ready. That is good, because now I can get back to getting more of the book ready to read.
Unfortunately, WordPress would not allow me to upload the files without putting them in an archive. I chose the RAR format because that is the software I have installed on my computer. It is a widely supported archive format. WinRAR is what I used (which is a free download), but many other archive software titles will also support it. It is not natively supported in Windows 10, but there are apps in the Windows store for unpacking RAR files.
If you have any difficulty opening the files, post a request for support in the forum and I will do all I can to assist you. Thank you for your interest in my writing, and I hope you enjoy the book.