Converting number to "K" and "M"

Hi- I’ve been searching solutions to convert numbers to “K” and/or “M” formatting. It seems one of the solutions is using conditional. However, all the posts I’ve seen can format condition with a text box which I can’t find anywhere (see the post link below).

Can someone help me on how to access the text box under conditional?

The element being selected has to be text for the “text” option to show in conditional.