I am having trouble putting my SigCard in my signature. When I tried to put my SigCard in, it kept telling me that, "It was not possible to determine the dimensions of the image."

I tried giving the images a size using [img={width}x{height}]{url}[/img] but that didn't work either. They turned into links.

I want to use code like this:
[url=http://internetometer.com/give/37981][img]http://internetometer.com/image/37981.png[/img][/url]
it works for this code, but not for my SigCard.

I'm not sure if I am doing something wrong. Does anyone know why my SigCard doesn't work? Thanks!