You can follow other people and ask them to follow you in return. You can then exchange messages through Italki. You can also give other people your usernames for different messaging platforms like Skype. I think there are also discussions somewhere on the site where people share various details.

thank you so much for your suggesion... can you tell me how to make a friends so that i could learn from them because i think chating and speaking with the native speakers would be the best way of learning..

You could go to the front page or click the 'Community' tab and read other people's questions, notebook entries discussions etc. or make your own. Making notebook entries in Japanese and asking questions about Japanese helps you get feedback and corrections from native Japanese speakers.