please go to the following URL:Twitter developer's account
You'll need Twitter account to get started. Open the above given URL and sign up with Twitter if in case you don't have a Twitter account.
Step 1
After creating your account go to Twitter developer's account and click option "Create New App"
step 2
Create App > App Name > Specify Application description, https Website URLs, Callback URLs, Tell us how this app will be used (required) > Create.
Finished! your application has been created.