Hi,
I want to make a blog site using joomla & k2 component. Today I face a new problem to mange users

I want a way:
1. That users login from a another link (not ......./administrator). So if user login from ...../administrator, the hacker will take a easy chance to hack my site. Actually I want tell you that, user login from a link & a pop-up page for k2 item making. So the user need not to login to joomla admin panel. After making item, user can't publish this. Because I want a way which gives me to approval the items (moderating)

Actually, I want that way which use in some forum like www.sevenforums.com
Please help me to do this....
Thanks
Sorry for poor English

The login to the backend is not K2 related. There are several tutorials and extensions on how to lock down your administrator area.

If you want to have multuple levels of access, then you should noe allow access to the backend. You have to do this via front-end editing.

This post will help you.
getk2.org/documentation/tips-a-tricks/201-allowing-users-to-submit-content