Well, that has been a step learning curve!
After loading WordPress which is a free website/blog design package on my Mac, the usual things happened such as needing to load other software to use it, in this case Apache web-server and PHP5 website scripting software, both also free! Don’t worry too much about the details but basically I had to set up a web-server on my Mac to allow me to develop and test a site locally. What I eventually realised was that I could install WordPress on my ISP/web-hosting companies site and do all the design & development there, thus avoiding all the problems of uploading the site when complete and ready to go live! It also negated the need for FileZilla ftp software on my Mac which would allow me to upload the website files.