A triadic colour scheme is slightly more complicated and uses colours from around the colour wheel. It involves combining three different colours that are evenly spaced around the wheel.
On the rotating scheme selector at the centre of your wheel, use the triangle shape to select different colour schemes. Point the arrow corner of the triangle at a colour you know you like, then look at the other corners of the triangle to see what colours it suggests you use with it – you can expect to see colours that contrast, but overall they create tonal harmony together.