There are a few ways to do this, I'll show you two:
You simply set the SelectedIndex property of the TabControl object you are working with the index number of the TabPage you want to display.
TabControl1.SelectedIndex = 0 ' First Tab
TabControl1.SelectedIndex = 1 ' Second Tab
TabControl1.SelectedIndex = 2 ' Third Tab
OR you can set the SelectedTab property to the TabPage you want to jump to.
TabControl1.SelectedTab = TabPage1 ' First
TabControl1.SelectedTab = TabPage2 ' Second
TabControl1.SelectedTab = TabPage3 ' Third
NOTE in the second example, 'TabPage1' is the name of the page objects itself. You might call your objects something else.