[DarkMultiPlayer 0.3.8.0 [KSP 1.12.0]]

I am having trouble with installing mods. is it just a drag and drop into the "Plugins" folder? can someone please help me with this?

[[1.0.2] Persistent Trails - record, share and replay track data! (May 14, V1.2)]

I'm having some trouble here. i have been trying to record a flight,and so when i start, i press the "record flight" button. when i press that the traill appears behind me. when i click the "add a log" button, everything is fine and a log appears, but every time i click "stop recording" the flight doesn't save. i would really like some help, like if im doing something wrong, can i get some help?