The text you typed is output here:
As in my previous pic. You cannot connect those two the way you want because from the engine’s point of view, it makes no sense. A slider is not text.
Besides, a rule of thumb in UMG is to not query widgets for data, have them report it - that’s what delegates are for. Even this bit is already set up in a dodgy, potentially unsafe way:
If this is a part of the standard template, it’s kind of spooky. Epic not following what they preach? It’s all a tad weird since sliders directly support ranges so there’s no need for remapping to start with. Irrelevant here though since you want to get rid of it anyway… 