To connect to that data source..
1. In desktop, on the "Connect to Data" page, select "Tableau Server"
2. Log in to your server
3. Pick the data source you published
One way to edit it would be..
1. Right click the data source name on the schema viewer and pick "create a local copy"
2. Edit the local copy
There might be other ways to do it. But I think the above should work.
That worked great! Thanks for the quick response!