I've seen stuff about it on studybass but they never really tell you how to do it.

Erm....not 100% sure what you mean. If you mean how do you play a chord in a scale then lets take for example Cmaj. In the C major scale you would play the notes C-E-G all at the same time.That would give you a Cmaj chord.

Right - you don't so much apply a chord to a scale as you EXTRACT a chord from a scale. A chord is generally the 1st, 3rd, and 5th notes of a given scale (and often the 7th as well). If it's just the three notes, it's called a "triad", and if you add the 7th, well, it's some kind of a Seventh chord.

Every chord implies a scale - remember that.

I think most of the time you actually want to think the other way around, how to apply a scale to a chord.

The page that describes all this is right here (http://www.studybass.com/lessons/bass-chord-patterns/about-bass-chord-patterns/) on studybass

Right - you don't so much apply a chord to a scale as you EXTRACT a chord from a scale. A chord is generally the 1st, 3rd, and 5th notes of a given scale (and often the 7th as well). If it's just the three notes, it's called a "triad", and if you add the 7th, well, it's some kind of a Seventh chord.

Every chord implies a scale - remember that.

You can use the 2nd (9th), 4th (11th), and 6th (13th) as well. Also chords can imply multiple scales.

You can use the 2nd (9th), 4th (11th), and 6th (13th) as well. Also chords can imply multiple scales.

Yep - there are no "rules", just "guidelines" and names for what we're used to calling things. But from a basic standpoint, the standard triad will get you there without confusing you with lots of other information. It's a good starting point.