1) Click on ((Here)) You need to click on Your Profile Page which is available in the top right hand corner and then click on signature if you want to get to the page manually
2) Paste your signature into the box there
3) Preview it and then save it if you like it.
4) That's it. You now have a cool signature for yourself.].
If you need anything else please don't hesitate to make another question or send me a private message. - Question Answered, moved to answered section.