You can find the option to set up 2-Step Verification for Bitly from the Settings/Security tab.
1. Log in to your account and go to your Settings. Once there, click the Security tab.
2. Click the Enable link under the 2-Step Verification header.
3. Enter the phone number you would like to receive your security codes.
4. Upon receiving the security code, enter the code to verify your phone number. This will enable your 2-Step Verification.
Disabling: When disabling 2-Step Verification, you will be asked to prove you have ownership over the account. For Bitly Brand Tools customers, you can see which sub accounts under your master account have enabled this extra security feature.
For more information visit: http://blog.bitly.com/post/90381427894/introducing-2-step-verification-for-all-users
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