"...but its a fishing scale..." It'll do. A pound is a pound. However, a 1 lb trigger pull is far too light for a hunting rifle. Bump a 1 lb trigger, lightly, and it'll go bang. Three smooth pounds is dandy.
"...How do I adjust the trigger..." You need the manual for your model of Voere rifle. Go here.
http://www.voere.com/html/downloads.html