SONY TRINITRON MODELO KV-21XME

Question

Dear Sir or Madam:
I currently live in Spain. A friend of mine gave me his mom’s old TV, a Sony Trinitron Modelo KV-21XME. I have one problem with this TV. I can not watch channel 3 and I can’t configure the TV to allow me to watch it. My friend told me he does not have the Manual for this TV? What Can I do? When I was trying to configure channel 3, I accidentally deleted channel 6. So I am missing two channels.
Can anyone help me?
Regards,

Jpza77