If you are totally new to scanners, I would start with floating your mouse up on the blue toolbar under the Scanner Master ad over
Wiki and select
Wiki Home. There you will find a purple colored section marked 'Links for Newcomers'. Read up on the links found there.
About 2/3 down the right side of the page, you will find a section called 'Popular Topics'. Select the 'Uniden DMA FAQ'. Read the first 3 links - then go to the very bottom and download the 'Easier to Read' manual (or order the printed version from Scanner Master) for the 396XT.
What software - if any - are you using? This is a mixed mode rebanded system that should be a snap to program, assuming all the control channels (there are only 3 listed - and nothing else?) are correct. The main players with this scanner are ProScan, ARC-XT, FreeScan (freeware) and BCTool (also freeware, but only the paid version gets the RR Download ability). Links for these can be found in a link from the DMA Scanners and Software article that's linked in the FAQ.
If you get a
premium subscription you should be able to download this from the database into the software and have the correct tables loaded. See the link for details on that.
best regards..Mike