This can be done only as a custom code modification. You can modify the code of Blog posts component of the core, but we do not recommend that to do in relations to future update problems. Or you can develop a plugin for that end or look for some existing plugin in the store intended for creation of seo friendly urls. 

Thanks Ross for your reply. I got your point. I had made a few new routes to work for me. 

If I am not bugging you then can you help me If there is some free responsive theme for Oxwall ?

I can't recommend any, please look up in the store. 

Sachin, you can search through our Custom Code Modificaitons forum to get some tips/directions on where you need to go to change the URLs.

For example: http://www.oxwall.org/forum/topic/9874

And again as recommended by Ross, search the Store using "SEO" keyword. 

Thanks a Lot Ross and Aliia. I really felt so nice to have a great and supportive community team with oxwall, very rare in most of open sources. 

Wish u all the very best.

Cheers !!!