To use EG Pulse kits, transfer them to your iOS device and open the Files app on your device. You will need to have the kits on your actual device (not on a cloud server like Dropbox) in order for them to open correctly (EG Pulse may throw an error otherwise).

Open each kit one at a time. Each time you load a kit, it will be added to your list of available kits (but the currently loaded kit will not show up in the list immediately). Leave EG Pulse and go back to the Files app and open another kit and so on. After loading each kit, the previously loaded kits should show up in your list of kits. Unfortunately EG Pulse does not currently seem to have a way of importing multiple kits at a time.