Hi Deb and welcome! It's great to have you here, and I hope you get lots out of being a part of the forum.
To create a signature, click on Profile, then Signature. Format the text and any add ons for your signature, and then click "send". I can see where you have already done that.
The next step is to click "on" in the preferences section where it asks if you wish to "always attach my signature". I think that I was able to correct this for you, and so the next time that you create a post your signature should be there. Just let me know if you have any more trouble with it.