When logged into vpository online, there is no way of deleting users as far as I’m aware. However, you can deactivate them.
To do this, go into the management screen and click on members on the left hand menu. Edit the user you want to deactivate by clicking on the edit button when you hover over a user. When on the “Edit User” screen, make sure the “Member” navigation option is selected and then uncheck the “Active” checkbox.
When looking at the list of members on the management screen, there is an option to “Show active members only”. If you uncheck this, it will allow you to view all members and allow you to make them active again, if you wish too.