Posting Instructions contain a link with detailed instructions on how to finalize the Vendor Set-up for data posting and availability checks (if either are applicable).
Go to Leads and select Vendor Sources
Search the vendor and check the box to the Left of the Vendor ID
Click the Copy Icon to the left of add Vendor Sources
This will copy the instructions that you can then post within the ticket.
Example:
Vendor 14962 GENERAL "General Bucket"
Posting Instructions: https://pba.tldcrm.com/public/post/14962/0c527812043576441927a488cbe083b9
Report URL: https://pba.tldcrm.com/public/vendors?vendor_id=14962&post_key=0c527812043576441927a488cbe083b9