Hi thenewleafer,
I'll provide some information about why you're unable to enter the 0.05% State Unemployment Insurance (SUI) rate in QuickBooks Online (QBO).
If you don't have the option to enter the said rate it may be because QuickBooks hasn't received an updated SUI rate from your state. Basically, states will send out updated SUI rate notices toward the end of the year or at the beginning of the year. That said, we'll need to wait for the update.
I've added this article for general tax questions based on your state: Access state agency websites for payroll.
Furthermore, I've added this article on how you can update the rate: Update your State Unemployment Insurance (SUI) rate.
Please don't hesitate to hit that Reply button if you have additional questions regarding your state taxes.