STEP 1 - Open CS2 commands console

STEP 2 - Enter the command: connect 149.202.64.64:27016

STEP 3 (Existing skin) Open the chat and enter the command below. You should replace INSPECTLINK with the corresponding skin inspect link
!i INSPECTLINK

STEP 3 (Non-existing skin) Open the chat and enter the !gen command you get from csinspect, screenshot below
Example: !gen 7 801 43 43 0 0 0 0 0 0 0 0 0 0

You can generate a !gen command for any combination of skin/stickers/float/seed on www.csinspect.com/craft


You can grab the inspect link of an existing skin from different places like a steam inventory or third-party websites




 

Im not sure if its because of the server but !gen commands would not work for agents, you must use the !i command

Discord of the CS2 server: ohnePixel's Server https://discord.com/invite/ohnepixel
There is a channel named #server-ips with IPs for different maps, and a video showing how to connect and use !i commands

Other guide i found: https://steamproxy.net/sharedfiles/filedetails/?id=2855852051