To create a role/Maintainer pair, please go here and fill out the form.
First, you need to pick a name for your maintainer, it can be anything, but it needs to end in -MNT for it to be valid. After doing this, you will also need to create a name for your role, this can also be whatever you choose, though it's common for it to be your network name followed by NOC. You can also create a person instead, should you so choose.
Next, fill out your address and email. I would recommend getting a PO box or alternate mail address, as THIS IS PUBLIC INFORMATION. Once you've filled out this form, click submit and you now have a role and maintainer pair!