If you are submitting information about a county-specific TRS, I would recommend starting at the
Puerto Rico main page, and then navigating to the county/province/district in which a specific TRS belongs, and then use the GRAY submit button for that county to submit the information about the county-specific TRS.
If, you are instead, submitting information about a country-wide, or multi-county TRS, then I would recommend starting at the
Puerto Rico main page, and then clicking on the GRAY "Submit" button, which is at the country-level, not the county-level. I'm sure you are planning on this already, but I would also recommend listing in the submission, all of the counties involved in the multi-county TRS, or clearly indicate if the TRS is country-wide.
Hope this helps,