Hi!

What should I do to allow "Registered" group users to create items in frontend? (I created also K2 users group correctly).

Because only Super Users can add new items in frontend, and for Registered answer is "The requested page can't be found." and "403 Access forbidden."

prntscr.com/17q6fr1

In K2 > User Groups. Create a group an assign the permissions.

In K2 settings > Site. Your may "Select the default K2 user group for new registrations"

Thanks! I did it. But in any way frontend form works only for super user

Are you using k2 user module to add new item ?

Yes, k2 user

073387.demo-website.online/en/login.html

login [redacted]
psw [redacted]

Add new item - and fail :(

i assigned all for test prntscr.com/17tdcn7 

When editing user group, check whether the category is listed in "Assign group permissions to these categories"

Solved. I found J2store plugin, that raise problem