When I try to Edit the connection on erwin models in Web Portal configuration window, the Edit connection button is grayed out. Why?
This is generally because erwin model does not contain either Data Movement Source or Data Movement Rules..
Please check your erwin model and make sure Data Movement Source specification and Data Movement Rules are defined in erwin file before you publish to Web Portal. Once the model is published with these properties, please refer below link for how to stitch model together for lineage: