If you have any questions about the entered information in the request from buyer side (it can be questions about any item or requested volume, specifications, prolonging of the request, etc.), you may contact directly the contact people of the request. For doing that please open the request. There are two possible ways to do it, first one is available on the "General" tab of the request where is displayed message from the owner of the request, start/end date, company name and a list of contact people from buyer side. Near contact people there is "Message".
Click it, in appeared modal window enter message (there is ability even to attach file) and click "Send" button:
The second way of contacting the user is available on "Items" tab. Near each item name there is displayed "chat" icon which you can also use for sending message for the owner of the request.
Afterwards, all your message history per this request will be displayed on the "Message" tab of this request.