How to remove the "register button"
Release : 14.3
Component : CA IDENTITY SUITE (VIRTUAL APPLIANCE)
Go to the Branding tab of Portal Administrative UI.
Select the Public site which is the "key looking icon"
Add a custom selector at the bottom called: [ng-click="_selfRegistrationClick()"]
Add attribute "display" for this selector, then set the value to "none !important"
You can find your css selector handles by using the Inspect page or Developer tools of any modern browser.
You can see from the browser dev tools (F12) that the Registration link is ng-click="_selfRegistrationClick()" as detailed in that KB.
If you would like to hide the Unlock User link, If you look at the next div section we see that the Unlock link is ng-click="gotoUnlockUser()" in the above steps.