Thank you for your post. In order to select only features in HIGHWAY where the NAME field is empty, please first create a new Selection in the MAP Selections window and open the Expression Builder.
The full expression is:
This will select features where the highway field contains a value (highway is not null) and where the name field does not have a value (an empty string).
Please let me know if I can assist you further.
All the best,
Avenza Systems Inc.