blal1ja
Hi
JA Magz template support Easyblog only, If you want to use the K2 in this template, you can use that, it will work fine, but there is no special style for k2.
It use default k2 style to display the content.
In demo site the content is from Joomla articles using Joomla modules , it can not pick the content from K2.
About the issue you are facing with K2, you can share the complete details of error with screenshot and submit a temp super user login for staff in EDIT FIELDS option, so i can check it.
Regards