I tried the instructions in the User Guide but I still can't sync iFinance data between the Mac and iPhone.

In most cases, the sync should just work. But as simple as it is to say that, if it doesn't, your best bet is to try the Ad-Hoc connection as described in iFinance Mobile's User Guide. In most cases, network problems are caused by router configurations. Your iPhone may have access to the internet over WiFi/Airport but still not be able to sync.

Now if these suggestions don't help, please configure your Mac and iPhone to access the network with static IP addresses. If this doesn't mean anything to you, we prepared a quick guide for that:

Quick guide to static IPs

If none of the above helps in your situation, please do contact us via the Contact Form.