Actions tend to link to the 'lightning bolt' on tools, like so:
This indicates that what is entered/passed through from the interface tool will then change what is in the target tool. Within the action tool you can configure how this change takes place and/or what it influences. Would recommend having a read through the knowledge base article below:
In addition to @DataNath's suggestion (which is great btw, I refer customers to that article often), based on your attached screenshot, I'm thinking a good "entry" point (i.e. the Lightning Bolt connection that DataNath mentioned might be the Filter tool you show on your canvas. Using this, you can dynamically alter the contents of the filter to filter on whatever name is typed into the Text Box tool...in your case, assuming "Nelson" is in your data, if the user types Nelson, and you have your filter set up to filter on the field 'NAME' for example, your workflow will run and only show data for Nelson. Just drag a connector from the Action tool and connect to the lightning bolt on the filter.