I want registered members of my site to be able to submit their own articles. How do I do that?

Simple!

Go to the parameters of K2, select "Frontend Editing" tab and examine the radio buttons!

The first one is "Enable front editing" and turn it to Yes.

Hi,

Sorry for the delay. I did what you wrote, and it's still wont work. What can I do?
If you can take a look, it's in this address , Just scroll down and hit "Submit icon" in the footer navigation.

Please help, I've tried everything I can do!

Thanks,
Efi