Adding colour to clouds

You do want  your first step to be creating a mask for the clouds. In my example below I created an AI Sky mask only because the entire sky is cloudy, but if you have a blue sky with some clouds then you might be better off with a Sky mask intersected with a Luminance mask for lighter tones, or a manual Brush mask.

A mask has many options for changing color. You can see that I used a combination of White Balance, the Color picker, and Saturation, but you can use whatever works. Note that most of these color adjustments will not seem to have much effect when the tones in the subject (in this case, clouds) are mostly near-white. Because of that, the color adjustments were not very visible until I lowered the Highlights and Whites values. You can try other combinations of Tone options that darken the clouds enough for a color edit to be more visible.

However, if your clouds are blown out (solid white), then there are no gray levels for a color edit to grab onto and there might not be much you can do except going to Photoshop and painting in some fake clouds or adding clouds from another image.

You can also see that my example looks fake, because the clouds now have color, but the rest of the scene has not yet been edited to reflect that color. Also, my cloud color is not totally believeable (one that you might actually see in nature).

For a technique, see:

https://www.youtube.com/watch?v=c6ju0I-eWSk&t=4s

In your case, perhaps, when creating the mask, do so as to select more of the clouds as opposed to the blue (in AI sky mask, intersect with color range, mouse clicking on clouds)

Create a filter to select the clouds, then change the color balance of the clouds, or change the color of the clouds.

I'm not sure I have seen red or orange clouds, that seems quite unrealistic to me. I have seen red or orange sky, however.