Hi,
This test is offered through two different exam providers. If you are a student in an academic institution you can schedule the exam through Certiport. If not, use Prometric. The URL that you posted includes links to both. Once you get to the Prometric
site, click the link to schedule your exam. You will need to enter your location information. You will then need to choose a testing program. Choose Microsoft fromt the first list and Microosoft technology associate from the second. the 98-364 exam is indeed
listed.
Mike Corkery, MCT, MVP (Office Systems), MCSD (Windows Store Apps), MCITP, MCPD, MSF, etc. Please do not forget to click “Vote as Helpful” if any post helps you and "Mark as Answer”if it solves the issue.