To activate the contribution service, you will have to submit a request through the dashboard, in your story profile. However, before you must comply with the following pre-requisites:
1.- Your story must be an "in-progress" story, not a "completed" story.
2.- You must commit to updating it regularly as stated in your "update frequency" field.
3.- Have all of your User Profile information complete.
After this, there is a button that will let you submit the request, where you will be guided through the activation process, we will require you to fill out all your User Profile information (if it's not filled yet) and enter your own PayPal account; this information is mandatory to get your Account Verified, and to activate your contribution service. Only verified accounts are able to use this feature. Finally, you will have to agree to the terms and conditions and then submit the form. Within 48 - 72 hours, you will receive an e-mail confirming or denying your account verification and contribution service request.