For iOS testing, you must be on an OS X device to make the signed build, you must first be signed up as an iOS developer, create a provisioning profile for your app (which has your test devices enabled), go to Project-> Sign iOS Executable…, select code signing identity (you may first need to set this up with Xcode)(choose iPhone Distribution option), select your provisioning profile file after having downloaded it (create for adhoc distribution), then click Sign and Upload. You will then need to go to the Defold Dashboard on the Settings tabfor your project and download the app listed there. This will download the Defold Engine app, which, once open, will then be able to have builds pushed to it once it as selected as Project Target. Check the later chapter for iOS for more instructions.