To register, you must create and enable a client certificate.
To register, send a Titan request to this page. The token will be your username. You may include your email in the body of the Titan request if you'd like to be emailed by other users, or receive important notifications. Make sure that you select the certificate with which you'd like to register!
From the FAQ:
𝐈𝐭 𝐰𝐢𝐥𝐥 𝐦𝐚𝐤𝐞 𝐲𝐨𝐮𝐫 𝐥𝐢𝐟𝐞 𝐦𝐮𝐜𝐡 𝐞𝐚𝐬𝐢𝐞𝐫 𝐢𝐟, 𝐮𝐬𝐢𝐧𝐠 𝐋𝐚𝐠𝐫𝐚𝐧𝐠𝐞, 𝐲𝐨𝐮 𝐜𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐞 𝐲𝐨𝐮𝐫 𝐜𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐞 𝐭𝐨 𝐛𝐞 𝐮𝐬𝐞𝐝 𝐨𝐧 𝐭𝐡𝐞 𝐞𝐧𝐭𝐢𝐫𝐞 𝐝𝐨𝐦𝐚𝐢𝐧 𝐰𝐡𝐞𝐧 𝐲𝐨𝐮 𝐜𝐫𝐞𝐚𝐭𝐞 𝐲𝐨𝐮𝐫 𝐢𝐝𝐞𝐧𝐭𝐢𝐭𝐲 𝐜𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐞. On the menu to create your certificate (titled "New Identity") change "Use on" to "Current Domain: maiaforum.net." Then you won't have to touch your certificate settings again.