To edit an opportunity that you have advertised onto Tenders.Net you will need to open the Manage Your Tenders hub.
For Delayed and Current Tenders you will find the Edit icon under the Actions for each tender.
Clicking the Edit action for a specific tender will show the Edit Overview page for the tender. From here you can click on the information that needs change to go to the relevant page.
Making edits to a tender is almost identical to adding the opportunity and your changes are saved immediately when you save the page.
For Registered Advertisers, after making certain changes the system will offer to Notify Suppliers of the change. This will pre-fill an Automated Amendment notice with the relevant details for your to review and send to all suppliers who have downloaded your documents and are still interested in your opportunity.