How to move an overlay?

Hello everyone . I have an episode story that is yet to be published and I really want to use some great effects. I’ve seen a story where the person used clouds and made them disappear , or in some cases make an overlay move with the character . My story is from the fantasy category and all my overlays are approved. It’s just I would like to make the overlay I uploaded move with the character or in some cases just move itself , and I don’t know how to direct the overlay . My character is holding a scythe and a ring of fire . Can someone please assist me with animating/moving/fading an overlay . Thank you .

Here’s the guide:

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Thank you .