http://resolutioncenter.ebay.ca/
This is the correct link.
The first thing they tell you to do is to contact the seller.
If you did that, and it was not helpful, don't continue.
Go to the second step and escalate to a Claim
Are you looking for your transaction number?
EBay only shows those for 60 days and you can only open a Dispute for 45 days.
Your transaction number will be viewable on your Paypal account. Have you looked there?
Now slow down.
You think you bought something.
You paid for it?
If yes, why are you upset??
Has it been more than 30 days and it has not arrived?
Did it arrive but it was not as described?
You did not pay for it?
Why?
Do you not know what you bought?
There is no 90 day guarantee.
Tell us what the problem really is.
Start at the beginning, go on to the end and then stop.