Gather the relevant information for your application: your social security number, the title of the piece that qualifies you for membership, who performed it and when and where, the name of the company that published it and the date it was released. Omit any information that does not apply.
Go to the "Join ASCAP" link on the ASCAP homepage. Click "Apply Now" under the "Writer" heading. A pop-up window will appear. Fill out the eligibility questionnaire.
Fill in the six-page application. It requests your personal information (including your social security number), contact information, member information, substantiation of your claim of eligibility, and your legal information.
Pay the membership fee on the final page of the application. The fee is one-time only and non-refundable.
Wait five days after receiving your ASCAP member ID. Then, go to the ASCAP homepage and select the link on the right side of the screen that says "Register Titles." Click the link that says "Activate Your Title Registration Account!" and fill in the form. When the activation has processed, you will be able to register titles of your compositions with ASCAP.