You can open a Blueprint Class in the Blueprint Editor either by interacting with the asset directly in the Content Browser, or by interacting with an
instance of the Blueprint Class that has been placed in your level.
Double-click on the icon in the Content Browser.
Right-click on the icon in the Content Browser and under Common, select Edit....
Right-click on an instance of the Blueprint in the level and under Asset, select Edit Blueprint name.
With an instance of the Blueprint selected, in the Details tab, click on the Edit Blueprint button.
Although these two methods involve menus attached to an individual instance of a Blueprint, please note that any changes made in the Blueprint Editor are made to the Blueprint asset.
As a result, the changes will be applied to all instances of the Blueprint.