I'd like the episode name and number

Dear Envisage, 

The episode is called, well, "The Yada Yada" and it is episode 153 on
season 8 (or: production code #8-19, the 19th episode of the 8th
season).

TV.com - The Yada Yada Episode - Summary
<http://www.tv.com/seinfeld/the-yada-yada/episode/2393/summary.html> 
(there is also - if you click on the top toolbar - a recap of the
whole episode, minute by minute; trivia and quotes and a discussion).

Seinfeld Scripts - The Yada Yada
<http://www.seinfeldscripts.com/TheYadaYada.htm> 

Wikipedia - the Yada Yada
<http://en.wikipedia.org/wiki/The_Yada_Yada_(Seinfeld_episode)> 

The DVD of the 8th season was released in 2006, so you can find it in the stores.  

I hope this answers your question. Please contact me if you need any
clarification on this answer before you rate it. My search term: "yada
yada"