To enable the Spoofed Similar Numbers feature, tap “More” (with three dots) in the right hand corner of the gray bar at the bottom of the screen within the Call Control app. Choose “Call Blocking Settings”:

In the “Spoofed Similar numbers” section of “Call Blocking settings” tap the small gray arrow next to “On”:

You will see the screen below, type your phone number into the blank line next to “Number” or choose it by tapping “Pick from the Contacts” icon, make sure Blocking is set to ON: