How to make a fomr invisible or hide it

Ok so I finally figured out how to call another form from a form. But I can't figure out how to hide or make invisible a form once the other form pop up. i tried using

userform1.visible = false...but that didn't work

I also tried

userform1.hide but this did not work either

Basically what i want to do is when I click on the button that calls the other form..I want the original form to disappear until I click on a button in the second form to bring it back.

I needed to put VBAProject in front of the code.

so to hide userform1 the code is VbaProject.userform1.hide...