Welcome to he wild, wonderful world of harp guitar. 
I use anything from the palm to wrist to lower forearm. The side of the thumb can work to dampen a lower string and a rest stroke with the thumb can work to dampen I higher string as well.
I’m still a relative noob to the instrument, but it’s a lot of fun. Enjoy!
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Alvarez DY61, MC90C
Crafter TRV23EQ/N
Huss and Dalton 00-SP, DS Crossroads
Kenny Hill Performance
Taylor Baritone 8, 314ce, 356e
Timberline T60HGc
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