My Options on the left hand column of your eBid page:
My eBid Stores
Click on the store you wish to provide a link to.
eBid Store Summary
eBid Store Link http://knit-wits-vintage-knitting-patterns.ebid.net/
Just replace my URL with yours for your signature.
Now go into 'settings' under top green banner.
Left hand column: Edit Signature. Paste your URL and you're done.