Using command buttons to move from one page to another in User Form

I have a User Form with 4 separate pages (multipage). I have a command button on each page. When the command button is clicked on a page , I want the user to either advance to the next sequential page or another page I specify. Looking for the code needed to make this happen. I think the reason I'm having trouble is because I think I need to create a variable for the different pages and I'm really struggling with how to set up variables.

A sample workbook containing a UF with four pages is attached.

Thanks,

Updated workbook with UF now attached. I pasted code in the UF code window button can't get it to work.