How does the \"Magic blow\" in Lindsay? (Pathfinder: Kingmaker)

Please tell me: how does skill magic blow in Lindsay. Usually had it with them not to compete, and then had the idea to make her a damage dealer. On all the time, but nowhere in the descriptions of the attack/damage does not display anything, the level of attack with power on/off - does not change. What to do? More precisely - in the description it is specified that each round using a quick action, you can imbue a weapon with part of their forces - it's for quick action and where is his button?
Thanks in advance!