How to create a custom user input field

Again I’m still a complete beginner at KNIME.

I can read multiple csv files with all the same layout. I can concat all those small csv file into on big table and give the user the ability to search for data. That is great. Now I want to build a screen in which the user can put in the data for the next row. How do I do that? Please give me a step by step guide because I’m still very very new to KNIME.