what plugin? What does it do?

Umair, I guess user who has provided the solution in the topic you have mentioned earlier has deleted it.
It would be better to create a topic in the Custom code modification forum  and apply to other members for the assistance or probably some community member already have a solution.

ok thanks. Some people say it is not possible because of the structure of oxwall. Is it true?

Umair, first of all I can say that the Newsfeed refreshing functionality is not good idea because it may result the high load of your server.  Meanwhile, there are no restrictions due to the Oxwall structure to implement this functionality. But Newsfeed is the complex component and you need to carefully think over its implementation.

ok. Oxwall is one of the best and flexible of social network applications I know, but not having share button and auto newsfeed refresh is a pity.

One more thing. I want to create a plugin, but I only know html and css. Is there any free user friendly source where can I learn php and js so that I can create a plugin?

Umair,  you may find useful for you our Crash course https://docs.oxwall.org/dev:crash-course#using-forms .
Also I may suggest  you to download our new Plugin Skeleton plugin to see how to use this or that function. Here is URL to the Store item:http://www.oxwall.org/store/item/695 .