How do I load my color palette?
Please define 'Load my color palette'?
If you want a specific colour, for example with text, you can 'set font color rgbEx(0, 0, 0)'
rgbEx being the colour you want (255,0,0 being red)
Your whole project doesn't need a palette set however.
I mean something like this. Do you understand?
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So you need custom palette in the Sprite Editor? You can submit a feature request here:
construct3.ideas.aha.io
It's probably easier to use some other image editor that has this feature, and then import sprites to Construct.
If you want to change colors in runtime, you have to do this with effects. For a single color you can use "Replace color" effect. For multiple colors you need a custom effect, like this one for C2, I don't know if any similar effects exist for C3.