There are wires on each output transformer connected to pins 5 and 10 on the output transformer, and instructions for where to solder those are provided on pages 69/70.
There are wires on each output transformer for the speaker binding posts. You have to select one!!! impedance configuration to use, follow those instructions on pages 67/68 for the impedance you select, then continue with the instructions on pages 69 and 70.
If you need further clarifications, consider posting some build photos and focus in on the output transformer wiring. If you followed the instructions for both the 4 and 8 ohm configurations, then likely no sound will come out of the amp.