myVOCS usage

I have listed down some "things to be done" and my experience with myVOCS usage,

1) for a new user the first question will be " What are VO's ? how will it be useful ? " ...something which has to be made clear so that it will be used.
The link "What is this tool" is a link to yubnub, rather this can be customized explaining the concept of myVOCS (yubnub relationship) and giving some more examples.

2) Once a user gets into any VO (say cms), there should be some link to get back to myVOCS page or see the list of subscribed VO's to jump into.

3) There should be a create command on myVOCS page and a small list of created commands and a brief description of the same.

I was not able to create any commands, i encountered the following error

NoMethodError in Command#add_command

undefined method `join' for nil:NilClass

app/controllers/command_controller.rb:7:in `test_command'
app/controllers/command_controller.rb:20:in `add_command'

4) In the myVOCS page, there can be a dropdown bar showing the list of VO's, or a link to list of VO's to join instead of the "Browse" link.