Open a browser(such as chrome)> type "gmail.com" in address bar> click on sign up to open a new account/or sign in if u already have one> sign up with inputing wanted information correctly>After completing signing up now "sign in" with your gmail account> Click on "compose" >Write your target email on "To" box > write your message tittle on "Subject"> Now write ur message body under here. and click "Send"