If I correctly understand what you are saying, I believe the default key is insert or home. I'm quite surprised there isn't a menu item for it in modify or something...
Hope that helps.
"We don't actually need to know that the main character has a past. All we need to know is that he has an objective and a lot of people are going to die and a lot of innocent inanimate objects are going to be destroyed and blown up before he can complete that objective."