In order to test the created build for iOS operational system you would need to create Ad Hoc version of the application. You can easily do this by following next steps:
Step 1: Click on Publish button and then Choose the platform you would like to test your application on (iTunes App Store)
Step 2: Then click on Submit Myself button located in the upper right corner of the window. Go through the first and second points. In Create Certificate section point download a certificate and go to developer.apple.com
Step 3: Log into your Apple developer account and go to Production section and press +. Then choose App Store and Ad Hoc option and then cick Continue
Step 4: Click Choose file and chose distribution_identity.certSigningRequest that you downloaded from your reseller site, press Generate.
Step 5: Download generated certificate and go back to your reseller website to Upload Distribution Certificate section and upload ios_distribution file, press Continue after.
Step 6: Go to apple.developer to create Distribution Certificate. Chose Distribution and press +. Then choose Ad Hoc and click Continue
Step 7: Choose App ID and click Continue
Step 8: Choose recently created production certificate and click Continue
Step 9: Click on Create Device button
Step 10: Plug your Apple device in to Mac and open iTunes. We need UDID (there can be: ECID, serial number and others. Click two times to view UDID)
Step 11: Go back to apple.developer, choose Register Device and enter the name of device, enter UDID and click Continue.
Step 12: After completing previous step click Register
If you need to add some more devices, go to All in Devices and press + (please, note that you may add up to 99 devices a year).
Step 13: Go back to Ad Hoc creating. The process may be restarted again:
Step 14: Now you need to check test devices (it will be able to install application to that devices via iTunes)
Step 15: Enter the name of certificate and click Continue.
Step 16: Download created Ad Hoc certificate and press Done.
Step 17: Go back to your reseller site and upload the certificate and press Continue
Step 18: Click on Download button in order to download the build. It will be given in the .ipa format that you may install it on the test devices via iTunes.