Do you understand what an update conflict is? If not, that’s what you have to change before you can address the issue.
If you do, you should know that you have to identify which two actions are causing the conflict. Only then you can change the code o business process to prevent conflicts. If you’re not a developer, you probably should get one to do the identification for you.
Also note that update conflict can also happen when another user is working with the order you’re changing and such a conflict can’t be really prevented without introducing some type of locking. Nevertheless if you get the error every time, it’s unlikely that there always is another user updating the same record at the same time as you.