1. portfolio filter will shown if you adding category for every of your portofolio. if you don’t have category on portfolio it won’t show.
blog filter only available on blog list, we don’t have those option on archive template.
2. go to jkreativ themes folder > template > rightheader.php and add bellow code on the most bottom of file : http://pastebin.com/Trq2gKV8
you can modify a href content and span content.
4. Unfortunately we dont have those kind of option for now.