No, that isn’t right.
As I said, the query parameter name is cmp. A query param name doesn’t include the question mark that begins the query string, nor does it contain the equals sign.
The entire query string looks like
?param_name_one=param_value_one¶m_name_two=param_value_two
See my response above? You don’t have the query param name in the box.
From the whole conversation I would suggest you do a little deeper research on how query strings, query parameters and related topics actually work. I find this a pretty comprehensive explanation: https://measureschool.com/how-to-use-query-strings/
From there, decide what the relevant information is you want to capture in Marketo and set those parameters (or keys are they are referenced in the article) up as fields in Marketo.
If you want to capture the referrer in a field, I would actually do this in a different way, but on the form you do as you showed in your screenshot, but only putting the parameter / key in as Sanford said.
I find this a pretty comprehensive explanation: https://measureschool.com/how-to-use-query-strings/
Pretty good but I am posting these corrections to the author, because it does have significant mistakes.