The SRAM Universal Derailleur Hanger (UDH) requires your frame to have a hangerless interface that is compatible with the UDH specifications. In other words, your bike must have been designed to be compatible with the UDH; it won’t fit on every frame. Please check with your frame manufacture to see if your specific frame is compatible.
Complete information about the UDH standard can be found at www.universalderailleurhanger.com.