For a signature, you go back to this screen:
And select edit signature.
Afterwards a box that is the same as the one you use to make a forum post will pop up.
You will need to format your signature's url to be like the one in this guide for posting images on the forums. And make sure you use a direct link for the signature's url as well :)
Thank you so much. I really appreciate it thanks for you help :Heart: