Hi Sabun!
So, you’ll need to download the source build, and then do the steps of copying over the Flurry code you download from the Flurry site, and then the Flurry plugin will compile when you package your project. 
You are correct that you will need to put the build on an iOS device for testing Flurry, and you can view the logs on the device using XCode to verify that events are succeeding.
Hope that helps - keep us posted!