ebay's stupid about this. you can reset your password but then they'll still send you an SMS(!) to verify it's you when you try to use your successfully reset password.
I no longer have access to that old number, i ditched that particular account cos it didn't mean much to me and opened a new one, wasn't worth the hassle.
And many services will be like, oh, haven't seen you in a while so we sent you this code to your email to verify it really is you.
Do it now.