For Mobile - Switch 1st & 2nd column of 3 column section

Site URL: http://www.precisionlandscaping.squarespace.com

I realize this should be simple as I have looked at and tried several other solutions, but none of them have worked. So, I'm apparently missing something simple, it would seem.

As per attached, I have 3 columns. The first column has 2 text blocks, the center is a photo that fills the length of the 2 text blocks. The third is also 2 text blocks like the first column.

On mobile, I want to switch the 1st and 2nd columns so that the photo occurs first, followed by the 4 text blocks (order of text blocks not important).

I have tried the flex method where #meet-owner is the name of the section, but nothing happens. Perhaps if I understood  the process, I would have more success. Currently, I do not understand the use of "section+.row" vs. "section+.span-12", etc. By understanding the concept, I would then be able ( I hope) to repeat it for other instances. 

Thanks in advance for any assistance or explanation.

Randy

/*reversing block order in a section on mobile*/
@media screen and (max-width:747px) {
#meet-owner+.row
  {
    display: flex;
    flex-direction: column-reverse;
}

}

What is the password