Modifying an existing pool is as simple as creating a new one. You will be presented with the same window as when creating a new pool. Values will be prefilled with current values used by the pool. Change whatever value you wish to change and click on the save changes button. A wallet popup will open and after confirming the transaction, pool values will be modified successfully.
You can change almost all parameters like APY, Lock period, end date in the modify pool section. NFT boost is also modified the same way