I have a few questions about K2:
1. How can get material ID K2 and add it to the material as part of a list of additional fields, or simply as an additional inscription?
2. In the form of adding material K2 to show additional fields need to select a category. How to make the possibility of autoselect category and whether it is possible to hide this field of category?
3. How to make the possibility of adding materials from the site of K2? For example, I created a link in the menu when clicked, the form appears to add or redirected to a page where you can add material.

These videos will help you with K2 getk2.org/documentation/k2class2012