1.
Where exactly should favicon (.ico file) be putted and what line should be written for it to show up on website?
Tryed to change it just changing any joomla favicon in the template folders. Then tryed to add some lines in index.php with no luck. Which file and how should be modified?

Have been making this on some other templates and it worked. This one is a little to much for my brain.

2.
When you move pointer on main page images, you see it going dark and title and menu name apears (for example "BLA BLA BLA in Blog"). On others you have only a big + apeearing. How can i change , so on any image i see only +?

1. Upload your favicon.ico into /templates/jf_vihrea/, delete cache & cookies
2. This item has category who has template "blog", you must select other template and you will see title etc...

Thanks for the answer. Tryed to experiment with this a little bit. But nothing changed. Maybe thats because i'm working on it on xampp at the moment in my localhost. Of course with cache and cookies deleted, also CTRL F5 for refresh used.
But tryet to change categories ant sub categories to template - blog. Nothing changed. Still in main page with cursor on images can see items name and category showing.
Tryed to change one of the default template categories from blog to portfolio template. it startet showing me name instead of +, but trying to change it back, didn't work.
I will try to experiment more, and maybe upload the site on internet to see how it works online. Maybe something will change.