Kadehome KH-HS30CT-BR, KA-HS30C-BR, KA-HS30CC-BR, KA-HS30CT-BR, KH-HS30C-BR, KH-HS30CC-BR Operating instructions

Hello, I have reviewed the Assembly Instruction and I'm ready to assist you with any questions you may have regarding the chair assembly. The document outlines the steps for proper assembly and includes diagrams outlining the necessary parts and their locations.
What is the first step in the assembly process?

When should the screws be fully tightened?