A will can be changed at any time by you as long as you have capacity to do so. To change a will, you have to have the same capacity you had when you made the will. You can change the will by adding a moment to it which is called a codicil. It can be a single item type codicil where you want to add someone to a will or write a specific request in a will. You can also use it to change the name of your personal representative or who you don't want to inherit from you.