Locate the larger bracket and place it down in it's spot. Reference the images for assistance.

Might make it easier to perform the below steps if you screw the bracket down into place. Reference step 36 for screw placement

Place something heavy enough to keep the flex cables back but light enough not to damage them (Ex: metal spudger)

Remove the blue adhesive protector from the touchbar digitizer cable

Align cable to bracket and press the flex cable firmly down onto the bracket

Don't remove the blue adhesive protector on the other side of the flex cable just yet