Cannot add sources

I successfully installed MyCurator, watched the instructional videos, signed up for the Pro trial, entered my API key, and created topics. I added “Get It” and “Source It” to my toolbar, and started browsing for resources. I selected a source. I thought that the “Feed URL” field would be filled automatically but, okay–I pasted in myself. The “Link Category for Feed” dropdown did not have any categories, despite my having assigned a category to each topic. Tried to add the source without a category, but it wouldn’t work. Said, “All fields are required except a New Link Category.” Hmm. Tried to add the source manually. Navigated to “Topics” and then “Add Sources” but simply found a blank page that said, “No Sources Found.”

I manage a large number of WordPress sites and was hoping to start including some curated content using this plugin. So far it doesn’t seem to work.

Any assistance would be appreciated.