I also want to my EN skills.

Hi Somayeh, It's a good question. I think you can improve your English language by improving your skills in listening, reading, speaking, and writing. You can do it by doing fun things such as listen and singing English songs, watching English movies or news and then repeat what the actors saying. You can improve your writing by posting your writings on italki. It great idea to find language partners (native speaker of English) and then make friends and talk with them on Skype. Most important of all kind of steps to learn English is practicing because practice makes perfect. Good luck!