As I add text widgets within a page in my home screen, They are going side by side. I have three text widgets as if there are three columns of text in my page. I like this, but i want to put a title above... so I want to add another text widget. Once I add this text widget, it appears as another column on the right. Where would i go to fix something like this? do i make the change in my theme/css/or is this something I can do in the UI of wordpress admin?

I'm new to wordpress so i'm still learning the whereabouts. Thanks!