Thanks for your reply, Becky.
Imagely’s replies were not caught in my spam folder, but I am using a Yahoo email account.
If you’re unable to reply to people who have a Yahoo email account, please write this clearly on your website’s contact form. Millions of people have Yahoo email accounts.
Regarding NextGen gallery not being intuitive, this is something widely discussed on reviews of this plugin online.
The best advice I can give you is to sit down with a typical wordpress user who is unfamiliar with your plugin and to have them try to accomplish different tasks.
I believe user testing will quickly show you how you can make the plugin user friendly.
