That snippet allows users of the site to enter shortcodes into an HTML Custom Field. I am not sure how that is related to what you want to do.
Other members have used the Title field to store a name, like, the name of a doctor, or the name o a freelancer or the name of a group member. You can really use the Title field to store a name, that shouldn’t be a problem.
If First and Last name are separate fields in your current data, you could merge them using a spreadsheet so they show up in the title as First Space Last, how about that?
I you are keen to have that information in the Description field also then duplicate it into that field too.
Import and Export are described on this page. Read it thoroughly to learn about options and requirements.
https://wpgeodirectory.com/docs/core-export/
If you need hands on help from a GD Expert for CSV ninja skills or stup then you can check here for someone : http://geodirectoryexperts.com
If you have more questions, though, write back and we will do our best to answer them.