You may want to power off the TV and remove the batteries from the keyboard, put the the batteries back in, power up the TV and try again before calling Samsung on the phone.
My Samsung Model VG-KBD1000 keyboard I seem to have done something so that I cannot type directly from the keyboard onto my tv instead I have inaddition to the normal arrow type pointer a round magnyfying glass/ring which I have to move around on screen keyboard with directions arrows and when I am over a letter/number I hit enter and it types it, anybody know how I can get back to direct working from keyboard of my Blue-tooth keyboard, it was Ok to earlier today and I believe I hit some combination of keys including F4 which may or may not have caused the change?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic