community builder and k2 do not integrate users

I am using latest version of k2 and community builder but found that if I use community builder login form, then the user is not created in k2 user table and this prevents users from uploading pictures to k2 profile. Also when a user adds a comment in k2 articles their profile pic does not appear and their real name appears instead of their username. Does anyone have a work around for this or know any extensions or bridges that fixes this integration issue...it would be greatly helpful...thank you,,,,,,

Thank you very much that showed the profile picture but I still have the issue of the members full name appearing instead of their username. any ideas?
Thanks

That's exactly what I thought, so I checked in K2 and it is set to username, but it is still showing the registered members full name on the comments form instead of their username. In my forum all posts are in the members usernames and in my k2 items its real names, which looks really odd. have a look if you like, my site address is

www.nomeatordairy.com and look under the comments on the video page.

Thanks and CB is fantastic, after my holidays, when I can afford to I am going to join an annual membership.