DBReplacer Replace Button greyed out

I wanted to try DBReplacer Free before deciding for the pro version. As a test I wanted to replace "created_by" with a new author ID, however, the "replace" button is greyed out and I cannot replace anything (anywhere)... any idea whether this is a bug or I am too stupid (J4)

Thorsten

First of all: Thanks for the quick reply! Great!

I tried, but although I see results of the search, the button is greyed out still. A screenshot is here: cloud.applicatio.com/index.php/s/5FpbbDsKqeEqq9n

THX

Works perfectly well... THX!!!!