Hi David
We apologize for the bad user experience that you are getting. There are basically two different advert views which present you with the edit button. We accept that the edit button does not work as it should for one of the views and this is being looked at. However, you may use the view which lists the various adverts under the category under which they are are listed and click on the edit button as presented and you will be able to edit your listing successfully.
The list of adverts under which your advert appears is on this url
https://www.agriuniverse.co.zw/machinery-tools-and-equipment/spraying-equipment-related.html which you may click and edit your advert.