Let's say you want to make changes in your contract and you have to renegotiate rooms, because you have new guests.
To do these changes, you have to be on the Proposal section.
Then from the Actions column you can select the option "Request Renegotiation of rooms".
Click on "Proceed" and a new window will open. From here you can insert your updates requirements and click on "Submit".
The hotel will contact you with a new offer.