I apologize because I don't have VeSys infront of me, but the process is quite simple if a lock has been left on a design.
Go to the Tools menu a select (and this is where I miss having the tool in front of me!) "Users" or "User Management". I dialog will appear which includes the option to remove locks (you may need to select your username first).
For your question #2, when you select Export for a project a Save dialog appears. On this dialog select the checkbox 'As Copy'.
When you subsequently import this XML, you will be prompted for a new name for the project.
There is no need to edit the XML