Very simple. Register, sync your GitHub repo, commit and push.
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Sign in to https://travis-ci.org/ with your Github account.
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Go to https://travis-ci.org/profile/ and enable username/openclassifieds2.
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Commit and push something to your username/openclassifieds2 repo. Go to https://travis-ci.org/, click on the repository on the left sidebar and select a job from the bottom of the main page to see the Job Log.