Like many of the other reviewers I immediately loved these chairs. As with many of the other reviewers the instructions made no sense. I read a review that cleared it up and only then did I understand the picture instructions. You’ll be working through the zippered portion of the base and will need to align the two circular holes with the screw holes to secure the base to chair. 

Note Once you get the first two screws in don’t immediately tighten all the way. This will allow you a little wiggle room to manipulate the plate to insert the final two crews. Once all screws in tighten with allen wrench.

Hope you love it as much as me!