Adding the octave, or perfect 8th interval onto some of your licks can really add a totally new flavor to your guitar solos.
If you'd like to learn more about intervals and the scales, checkout my Guitar Scale Patterns course.
In this lesson, Colin demonstrates how you can use the octaves all over the fretboard. The general rule for finding the octave is to go down 2 strings and up 2 frets... however you have to be careful, because if you're crossing the 2nd string (B) you'll need to add one more fret onto that pattern for it to work correctly. Colin talks about this in the lesson.
The hardest part about getting this riff down correctly is learning to mute the string in between the two notes you're playing. In general, I like to rest my index finger lightly on that in between string to cut down on any noise it produces. It's worth practicing a bit just to make sure you can get a clean interval while you're strumming.
Alternatively of course, simply finger pick both notes together, or one after the other, and avoid the problem entirely.
You can find many more guitar lessons by Colin Daniel at RiffNinja.com.
Using Guitar Octaves In Your Solo:
Watch the Guitar Octaves lesson on Youtube