Physics q

I don't get from the highlighted bit onwards.. Can somebody please help me?? What is non-zero magnetic moment and what does it have to do with nucleons exhibiting magnetic properties? The rest sort of also didn't make sense. Thanks a lot!!!

I am not sure what you are trying to ask.
The nuclear angular momentum has a nuclear magnetic moment associated with it. The magnetic moment of a nucleus is measured in terms of the nuclear magneton.
http://hyperphysics.phy-astr.gsu.edu/hbase/Nuclear/nspin.html#c2

The treatment of nuclear angular momentum with nuclear magnetic moment is analogous to electron angular momentum with electron magnetic moment.
https://en.wikipedia.org/wiki/Electron_magnetic_moment

The paragraph is introducing the concept of nuclear angular momentum and stating the association of nuclear magnetic moment with nuclear angular momentum.