How to rig a custom character with no detached parts + texture not working

Repost because my post got closed but I made this custom character but the thing is that It’s 2 parts ; the head and the body, I also can’t seperate it. I’m confused and don’t know what to do so how can I rig it in roblox studio ?
I’ve tried with rigEdit but since It’s 2 parts Idk how to do it

Also when I import any other texture It will be the main color of it

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Would anyone be able to help ? I did try to scale the character bigger and re-import the textures but still not working

Can anyone help, is it impossible to rig this ?