Carefully lift the touchbar assembly up and out of it's little crevice

Remove the black adhesive protector from the touchbar

Carefully align the touchbar to it's crevice

Once perfectly aligned, place the touchbar into it's crevice and push firmly but not hard on the touchbar to finalize it.

You may only have one shot at aligning the touchbar properly once the adhesive touches the Macbook. So be careful, precise and don't rush it.

Once this is done, follow this guide backwards starting with Step 35 to reassemble the Macbook