So long as you have the correct edit permission for the supplier associated to the selected deal, deals can be edited at any time.
Please note — most aspects of a deal cannot be edited, however, once the scheme is in automatic workflow. Also, if the Cash module is enabled, certain aspects of a deal cannot be edited once cash has been assigned to its associated deal lines.
To edit a deal, simply click on the Browse menu at the top of the page, and then on Suppliers in the drop-down menu. Select your supplier from the list and then choose the deal you wish to work with within a selected scheme.
Finally, you will notice the Edit deal button becomes available to you. Clicking on this will take you to the page displaying the deal settings that are available for editing as required (an example is shown in the screenshot below).
After you have finished making the changes you need to make, make sure you click Save at the bottom of the page.