Oh cool in most of the countries you can register and get samsung just for free .but i got mention of it sharing this link
https://www.gokano.com/ref/QPqWZh5FyfxDZyJq1TFC2ZW
In This video I've collected all my experiences come from youtube it self about how to go to the other activity by clicking a button
Further more, when you want to go to the other activity from main for example you have three types of code
آی-ویدئو