A bar of 6/8 has 6 beats strictly speaking.
But you group them in threes, so then it has two groups of triplets. You can put a chord in each of those.

Load up some jig styles and load the songdemo for them and see many examples of how this works.

For example, here are the words for a bar of macnamaras band. Each bracketed group is a beat in 4/4.

[NAME is] [MAC na] [MAR a] [ I’M the ]

Have Fun!
Peter Gannon
PG Music Inc.