如何从活动中打开另一个活动？

My problem is the following. my app has a 1 welcome screen where the user ckick the "continue" button and it goes to next screen. The next one contains a menu with several buttons. my problem is that I can not open another activity on the second screen (on the first screen it opens normal) more or less this scheme below (| activity1> button continue | >> | activity2> button continue2 |> does not respond) to compliment and test apk on a galaxy grand duos 4.2.2My problem is the following. my app has a 1 wel