putting a picture as your signature

[Tornado of Soles]

I dont know if someone already posted about this yet and I apologize if its already on here but I was wanting to put a picture as my signature and my computer is broken so im having to use my cell phone and it seems to add a picture u need a url and all the pics on my phone are not show in up with a url so im basically asking if its possible to set up my signature on my cell phone no if its just for computer thanks for ur time.