Can it show chords?

Here are a couple of links to discussion re: your request:

http://musescore.org/en/search/apachesolr_search/automatic%20chord

http://musescore.org/en/project/findharmony

If you just mean you want to be able to enter standard chord symbols like "G7” into your scores, then see Chord name . If you mean you wish to be able to create fret diagrams or tablature, there is very limited support in the cirrent version, but this will be improving.