Rear Derailleur is adjusted in the factory but due to part movements during shipment, slight re-adjustments might be necessary. Derailleur adjustment are done by barrel adjuster and “H” and “L” screws as shown in photo 1. Please refer to the video in the link below:
How to Adjust a Rear Derailleur – Limit Screws & Indexing
IMPORTANT: Please note as the derailleur is already adjusted in the factory, any issues in changing gear between gear #2 to #6, should be easily solved by turning the barrel adjuster (As per instructions in the video). After the gears are smoothly changed between gear #2 to #6, please test gear #1 (the largest cog) and #7
(the smallest cog). If you have any issues on gear #1, you need to adjust the “L” screw and if you have any issues on gear #7, you need to adjust the “H” screw as explained in the video.