How to enable a State based Tax on a PayPal form

I am trying to charge state sales tax for Oklahoma only on my PayPal form. I have set up the payment wizard to do so but it is not charging it. Can you look at my form 

Upon viewing the tax settings, I seems there is no a base tax rate:

Please take a look a this step by step guide to help you accomplish that: http://www.jotform.com/help/296-How-to-Add-Tax-to-Your-Payment-Form

Let us know if you have more questions, we will be glad to assist you.

When I assign a base rate it applies it to all states. I only want to charge Oklahoma buyers.

There was a space after the 'Oklahoma'_ on your form tax configurations. I have removed the space, and also added the 'ok' option.

It seems to be working properly now.

Please feel free to contact us if you need any further assistance.

Thank you!