My bank account is from Guam (a US territory). It won't allow me to pay taxes through the direct debit option. I don't have checks and cannot secure them by April 15

[KarenJ]

We accept credit, debit, and pre-paid cards with a Visa, MasterCard, American Express, or Discover logo. Like many other U.S. online merchants, we can only process cards with a U.S. billing address.

If you do not have a US billing address, perhaps you have a friend or relative in the US that could assist you.