I know that we had a way on the old forum to show a link to our Ebay ID page within our forum profiles, but it has stopped working since the forum update.
Now, I have added a field in our profile where we can enter our Ebay ID page link and it will show up in our profiles and mini profiles for others to see. To do so, goto edit your profile and under the "Personal" tab, scroll to the bottom of the page and you will see the field to enter your Ebay ID, in the forum of your Ebay Profile URL. It will look like this, except it will be your Ebay ID in place of mine:
Linking to your Ebay profile in this forum is a good idea as other members can see what else you have for sale on Ebay and can also checkout your feedback if they are planning any future deals with you. If anyone is having trouble adding their Ebay ID to their profile, please PM or email a staff member.