Copy each line, one at a time.  Go into ACT -> Custom Triggers -> Click on the "Import XML" button at the top right.

<Trigger R="14:1A6C:Cruise Chaser starts using Optical Sight" SD="Shiva" ST="3" CR="F" C="A11s" T="F" TN="" Ta="F" />
<Trigger R="14:1A6D:Cruise Chaser starts using Optical Sight" SD="Edge" ST="3" CR="F" C="A11s" T="F" TN="" Ta="F" />
<Trigger R="14:1A6E:Cruise Chaser starts using Optical Sight" SD="Stack then spread" ST="3" CR="F" C="A11s" T="F" TN="" Ta="F" />