I lost my remote how do i go to video 2 without the remote

a make and model are needed for FIXYA Folks to help.
try a repost with the info.

Without a remote control; you can't unlock it.

How do I take the lock button off a Sony DVD without remote

There are guy's on e-bay that deal in nothing but remotes

You can order a replacement remote (other fixya's have it listed.

http://www.fixya.com/support/t8230570-dropped_remote

Another option would be getting a logitech harmony brand remote, (It is programmable via the PC) which will allow this.

I know that a lot of universal remotes will be able to do this as well. (For example ATT Uverse has remotes that allow this to be changed).

Most video's will switch to aux imputs by pressing the up & Down channel selectors.

If you mean you lost your RF converter, which enables you to connect your game to the antenna input, you can connect your game to the connectors on the front of your TV to video 2 input with a Video and Audio cables. After that select video input 2 from your remote controller or TV buttons. You can also connect it to video input 1 at the back of the TV.

I just purchased one of these televisions and it didn't come with a remote. However, a Philips Universal Remote (SRU2103/27)
with a code 0520 works fine. I haven't explored all the codes but I can easily change from tv stations to Video 1 and Video 2 merely by pressing the "Input" button on the remote.

During a recent move the remote was lost. I have the 6420FF in my son's room and trying to set up dvd and wi console set up, but cannot adjust tv via menu button on tv. Is there any way to set-up game system and/or dvd without remote?

I looked at the manual and it seems like there is no way to do it thru the menu button.  
You can download the manual here.
http://www.funai-corp.com/6pdf/om/IWT3206.pdf