The TRIM notice is on the Sumter County Property Appraiser's site - not the Tax Collector's website.
This is the link.
D_SearchResults
Once you click on it, type your name in the Owner's name box at the top.
The click on run search in the lower right hand corner.
That should bring up your name and parcel ID.
Then click on the parcel ID and it should bring up information for your property. The TRIM notice is in the upper right corner (says 2022 TRIM (pdf). Click on that and you should have your taxes.