{submittedByID} to Primary Contact Expression

Hi all,

Can't seem to get this calculated field to display correctly, I need to replace the {submittedByID} with the name of user submitting the request.

As {submittedByName} doesn't appear to be a native field.

REPLACE({submittedByID}, {submittedByID}, {name})

Feels as if I'm missing something really obvious here!

Andy