In order to get access to .99% fees for buy instantly, you must either have bought at least $5000 of Bitcoin or be on a prepaid annual plan of $50 or more per week.
If you are on no recurring purchase plan or a pay-as-you-go plan and have bought less than $5000 of Bitcoin, then your buy instantly purchases will be billed at 1.49%.
In order to switch from a pay-as-you-go plan to a prepaid plan, please click "change plan or bank account" from your dashboard.