You have the wrong forum for this ... go over to the "universal remotes" forum, and post a message with subject like
"need code for Toshiba DVD on Yamaha remote"
and put in the model #s for your DVD and receiver (+ any model # printed on the remote) in the post body.

The instruction manual for the receiver should have a table of remote codes somewhere inside; look through the whole thing and also through other documentation provided with the receiver.