Following the link from that page it looks like it takes a phone call or two.
"
Before collecting and shipping specimens for Novel Coronavirus (2019-nCoV) testing, please call the Missouri Department of Health and Senior Services at 877-435-8411 for approval.
Note that before any specimen is sent for testing, DHSS staff must first be consulted!
After consultation and determination that the patient meets the criteria for testing, contact the Missouri State Public Health Laboratory (MSPHL) at 573/751-3334 or 800/392-0272 if you have questions regarding collection and shipping
prior to collecting the specimens. This will help ensure that proper specimens are obtained in the right quantity, and that they are packed and transported properly."
https://health.mo.gov/lab/ncov.php
I did find a pack of N95 masks at Menard's this morning so I have that covered for grocery store visits...
JT