The chance potion effect overview is a menu where you can view and modify a list of potion effects. If you currently have a single potion effect with the heal effect type, a duration of 1 tick, level of 1, and a chance of 100%, it should look like this:

On the left are the 'Cancel', 'New Effect' and 'Apply' buttons. Additionally, there is a red cross, effect type button, duration edit field, level edit field, and chance edit field for each potion effect currently in the list.

• The 'Cancel' button will bring you back to the item edit menu you came from, without keeping any changes you made in this menu.
• The 'New Effect' button will add a new potion effect to the list and add its corresponding buttons and edit fields.
• The 'Apply' button will bring you back to the item edit menu you came from and keep all changes you made in this menu.
• The red cross on the left of every potion effect row will remove the corresponding potion effect from the list as well as its corresponding buttons and edit fields.
• The effect type button (only the 'Heal' button in the screenshot above) allows you to change the potion effect type of its corresponding potion effect. The text on the button is the currently chosen potion effect type (or the default one if you haven't changed it yet). Clicking it will bring you to menu where you can either click on 'Cancel' or on a potion effect type. Clicking on 'Cancel' will bring you back to this potion effect overview without changing the potion effect type. Clicking on any potion effect type will change the potion effect type of the corresponding potion effect to the type whose button you clicked. Note that this menu uses the Bukkit potion effect type names rather than the minecraft names you are probably used to. This is because it's easier to work with for this plugin (and other plugins).
• The Duration edit field allows you to change the duration of its corresponding option effect in ticks, NOT seconds (1 second is 20 ticks). The duration must be a positive integer.
• The Level edit field allows you to change the level of its corresponding potion effect. The level must be a positive integer.
• The chance edit field allows you to change the chance of its corresponding potion effect. The chance determines how likely it is that the corresponding potion effect will actually be given. If it is 100%, the potion effect will always be given. If it is 0%, the potion effect will never be given.