Ok, there isn't any text in your Signature box, so a couple of things could have happened. One might be that you didn't hit Save. The other might be that you're putting the text somewhere other than the Signaure box and it's not saving.

I'll put "Insert Text Here" into the Signature box so that you know where to insert your Ticker info. Go ahead and go back into your User CP, scroll down to the Signature box, click Edit Signature, paste the ticker code in there, then hit Save. I can sort out any HTML problems from there.