Can't see the functionality advertised in app download page! – Evite: Party Invitation Maker Review

On my iPhone 6s, I can't add more guests from the app. The phone number field is empty but it won't let me add my phone # from the app. Near the edit link it says "web only"! I have been forced to use the desktop application on my computer browser to do even the simplest things like adding more guests. Kind of surprised by this, disappointed for sure!
Review by KiranKB on Evite: Party Invitation Maker.