Launch Safari from your iPhone, visit www.docommerce.me and tap the blue alert about budgeting on the go.
Tap share from Safari Mobile then choose "Add to Home Screen". The app behaves like any other one downloaded from Apple App Store.
In order to prevent your email provider (Gmail, Outlook...) to put the "Calendar event" message to your Spam folder, add email@example.com to your mail contacts.
Any questions? Just email your questions to firstname.lastname@example.org. We understand French, too.