Make sure you follow the instructions specified in the readme file, and that you see the following directories (in addition to all other related directories): wp-content/plugins/all-in-one-video-pack/admin
wp-content/plugins/all-in-one-video-pack/...
Make sure you have your blog's name set through WordPress. It is a read only field in the plugin's settings page. If the blog's name is not set through WordPress, the registration process cannot be completed.
Yes, we recommend that each user open a different account, unless they want the blog to be dependent on other blogs as specified in the FAQ about multiple blogs . ...