You need to do some things before you can use the Amazon Mechanical Turk:

1) Visit http://aws.amazon.com/ to create an Amazon AWS account.

2) Configure the MTurk Perl module with the following command:

   perl -MNet::Amazon::MechanicalTurk::Configurer -e configure 

   Your configuration file will be created in the file
   /var/root/.aws/auth.

3) Try out the samples in /usr/local/share/examples/Net-Amazon-MechanicalTurk,
   if you like.

4) Use the MTurk Sandbox to create HITs in a development environment for
   free. This Perl module uses the sandbox by default.

5) When you are ready to submit real HITs, add the following line to your
   /var/root/.aws/auth file:

   service_url: http://mechanicalturk.amazonaws.com/?Service=AWSMechanicalTurkRequester

   DISCLAIMER: No one but you is responsible for paying MTurk workers for
               the HITs that you submit to the live service. Please make sure
               you know which MTurk service you are submitting HITs to -
               the sandbox (default) or the production service.