I think I can help you with that. Copy the URL of the page you want do link to; Click on your AFN name at the top and choose Signature:
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Type the description in the box of the page as you want it in the signature, Highlight it.
Then click on the link symbol and Paste the URL in and save.
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Test the links by going to one of your posts. It only allows so many links out of your signature so be aware of that limitation.