Check out the Unreal video tutorial series (made by Epic Games), it should be on the email when you signed up (or just look for them). Blending animations like this is built in functionality in the editor, there’s no special tinkering required - just watch the tutorial series. Some of it may seem like it’s too simple but, sit through them all anyway - the point is to teach you the editor and where you would go to look for other basic things if it doesn’t cover something specific for you.