Custom PHP modification on a Wordpress Plugin - Table Press

I need a custom PHP modification on a Wordpress Plugin. Need it done as soon as possible ! Please says when you can start and be done :) I use Table Press to display tables on my site. I currently use html full link, but I would like to have icon option and easy backend. So you must add a dropdown choice of icon, with text field for URL on some cell on my table . See 2 images in attach piece Explain me how to add/remove option in the dropdown choice. No need to buid admin panel, just show me where is the PHP files. Must be done soon. You start now :) Good luck