Hello,
I can't seem to figure how to use the 'Key Value' box. What am I supposed to type in this?

Here's the file it is referring to:

The cells A7 and E7 (not on the picture) are supposed to be modified so I configured an 'Update a row' step.
I tried to type 'Full name + user ID', it didn't work. I tried to type '1' (because it's the first row in the table), it didn't work.
What must I do, please?
Here's the error message:

So how am I supposed to do, please?
Thanks in advance.