Similarly, I'm trying to delete an old pulse and I'm not able to find where to edit it. The creator of the pulse is also unable to find any edit ui. Would love any advice!
I was able to resolve my situation by using the search bar to search for the user's Personal Private Collection and move each of the pulses into a public collection. Once I moved the pulses, I was able to edit them. Hopefully you'll be able to find them in the personal collection & delete them from there.