Clicked event

I made a user interface and I want to make this ui clicked event.
how can i make this event at level blueprint??

You want to click a button on a UI and have it do what exactly? Please clarify the issue a bit more.

When you Spawn the Widget, save a reference to the widget instance. This might be in your Level, or GameMode, or in the HUD.

Then In your level BP, get that reference from where its stored. i.e. If it was stored on your HUD, do Get HUDCast to MyHUDClass, then get the saved Widget Reference, then from that get the Button Reference, then Bind an Event to its on Clicked Event