Bush TVs have been made by a number of different manufacturers and each manufacturer may also vary how their TVs need to be tuned in.
Your question needs to include which model of TV the Bush is.
It would also help if you stated what you have tried so far and in what way did the TV stop you from tuning it?
What did the instruction manual tell you about tunig? Have you tried it? What happened?
Also which service are you attempting to tiune into? Freeview? RTE? Freesat?
Also is the TV connected to an aerial, cable or satalite?
Any other relevant information about your TV set-up would help, including whether you have had other TVs tuned into the same signal source.
Neil S, January 2014