LookupAttibute Example

[#1]

I'm hoping someone can point me in the right direction. I have a SimpleKeyValueLookupService configured with some sample type I'm attempting to lookup. The way I understand it so far (from all the searches I've done) is in the LookUpAttribute I create a Dynamic Property of 'key' and set it's value to be in my case ${column_name}. So my question is where does the result get returned into?