If you are building an iPhone, then you can't download it from a website, it has to be published to the Apple app store and then users would install it from there.
As for building an iOS app, you can follow the steps here: http://help.gotiggr.com/documentation... or use PhoneGap Build service: http://build.phonegap.com
One more options is to build and install Tiggzi tester app for iOS. You would follow the same steps as above.
With Android it's simpler, you can export the binary file which is ready for the Android Market: http://help.gotiggr.com/documentation.... You can just email the app to your phone and install it from there. You can also install the tester app on your Android device: http://help.gotiggr.com/documentation... which will allow you to quickly test the apps.
Lastly, you can build a mobile web app (HTML). Any device with a browser will be able to access the app without needing to install anything.
I know it's a lot of information/links - but hope it helps.