Hiya Freya, I'll try to help you set this up.
STEP 1
First you'll need to click the "Welcome Foxsdin" at the top of the page. The picture in the spoiler below underlines the link you should be clicking. (It says Welcome Lily Rain for me)
- Spoiler:
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STEP 2
Now click on the link that says "Edit Profile". Link is underlined in the picture.
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STEP 3
On the following page, click on Signatures. It is located in the myriad of links I've highlighted.
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STEP 4
On the signature page, copy and paste the BBCode given to you by the XIVReborn website, preview to make sure it's working then save the image.
- Spoiler:
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STEP 5
For the Avatar, you'll want to click on the Avatar link next to the signature link, and it should bring you to the Avatar page. You can either upload an avatar from your files or from a website.
Hope this helps you!