Problem to turn off/on comments in K2 article

Where is possible to turn off or on comments in K2 article of this Gavick template and add author profile in the bottom of the article? Is it posible to delete comment of user login via Facebook?

Here it is off, I need it on:
http://1241.w41.wedos.ws/index.php/astr ... -reference

Here it is on:
http://1241.w41.wedos.ws/index.php/comp ... -objednate

Hi,
K2 has it's own settings, so it's not related with template.
In most cases you have to turn it off in K2 category options.

Is it possible to delete comment of user login via Facebook?

Manually yes, in K2 Comments (admin panel).
Sorry but about features, possibles and request about K2 .... use http://www.joomlaworks.net/forum/k2 only
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It was written here: https://www.gavick.com/joomla-templates/league-news