When satisfied with the first layer of wire bits, start heating the area around the wire assembly with a bushy flame that is not full force. The force of the flame can move smaller wire pieces so have a solder pick handy to move things back to the general area they came from, if needed. Keep heating around the assembly, moving closer and closer to the wire assembly until finally being able to heat across the layered wire bits. The wires will turn frosty before they become shiny before slumping into one another. Keep the flame moving around because an area can melt into a blob pretty fast if your mind wanders. Once the wires slump into and onto each other, fusing has taken place.
Let the assembly cool on the Solderite board. Picking it up too soon results in bits of Solderite sticking to the back of the assembly. If that happens, those bits MUST be removed from the back of the piece before continuing to the next step. If bits of wire are left on the board, fusing was not complete. No worries, just add them to the next layer.