Answer to problem with adding a TV Series credit to an actor's information

For the longest time, I could not figure out what I was doing wrong!  I filled out the fields in "Filmography (acting)" area, but it kept telling me "This credit has been rejected. You need to correct this credit before it will be accepted.  The title is not currently in the database." but I had been to your page for that episode, so I needed to know how to enter it so as to not be rejected.  I put the series name, then (TV Series), and it kept asking me if I mean a movie title with a similar name.  Finally, I doped it out that I needed to copy and paste the alphanumeric code for that episode from its url ... whew!  Hope this helps others with same problem :)