The potion aura edit menu can be used to create or edit potion aura projectile effects. These are projectile effects that will give potion effects to all entities that are close to the projectile. This menu should look like this:

The right side of the page can be used to configure the actual potion effects. You need to select at least 1 potion effect, but you can select as many effects as you want. Each potion effect is represented by a single row. In every row, you can select the potion effect type, the duration (in ticks), and the level of the effect. Click the green + button to add a new effect. Click the red X on the right of a row to remove that row (and the corresponding potion effect).