Hi @kutzee@aol.com
Here’s a link to the relevant section in the [https://www.manualslib.com/manual/184622/Uniden-Dct5260.html?page=23&term=ringer+settings&selected=1#manual|user manual] for your model phone, that shows how to access the ringer settings in the menu area.
Make sure that the ringer setting is NOT set to ''ringer volume OFF'' but that it is set to either ''ringer volume low'' or ''ringer volume high''