Hey. Welcome to the forums.
Towards your question you are most likely looking in the wrong place.
Firstly start of with a website that does them (Like Tit.it)
Then fill in the details.
They will then give you a link. Copy and paste that link and put it in brackets
If you want in your forum signature, repeat them steps but go to these forums > Profile > Signature and paste it in there with the brackets round there.
Any problems ask again