Step Description is a User defined text field on test scripts. The Step Description field is a reference field on script assignments during test execution and is populated by the step description added on the original test script.
Within the contains/does not contains value for the "StepDescription" field, you can use Lucene query parser syntax - including * and ? wildcards.
See the Lucene Query Parser documentation for more information.
To find all test scripts that contain "verifies access" in the step description, write the following query:
EntityType = Script AND StepDescription ~ "'verifies access'"