Please upload ipa file to your host example /public_html/app
Now edit app.plist file :
replace [you app url here] with
http://yourdomain.com/app/app.ipa (app.ipa is your file)
replace [app version] with app version that you seted in B4i
replace [app title] with your app title that seted in B4i
And edit index.html
Replace [your url] with app.plist path,example
http://yourdomain.com/app/
And upload app.plist and index.html to /public_html/app
Now you can install app in your device