Step 1: Go to https://apps.twitter.com/
Step 2 Click on Create New App
Step 3: Create your application by filling in the form
NOTE: in the call back URL you can leave it empty or fill in any valid URL in the website field; for example http://www.xpeedstudio.com. When filling in a URL you must use the “http://” first.
Agree to the Terms’s & Condition’s below
Step 4: Your Application is created and API Key available
You have now created your own Twitter Application. Now your new Twitter API Key, API Secret, Access Token, Access Token Secret can all be entered into the backend of your website WordPress so that Tweets you make in Twitter can show up on your website.