How do I change the input selction without the remote?

Answered.

You can't select the inputs, without its remote control.

You can't select its input without its remote control.

As there is no menu button on the front of the TV, you must have its remote control to select he inputs.

You are trying to connect the TV by AV setup. You have to select the input selection to TV to AV. If the TV have a Menu button on its front panel, you can enter into its menu options, surf through, and select the input selection window. Here you can select input to AV.
If there is no 'Menu' button on the front panel of the TV, you can'd do this selction. You must have its remote control to select this option.

There is no way to change the input to this set without its remote control.

According the manual for this TV the remote control has an input button, it is left of the power button. Make sure that the remote mode slected for TV not VCR or DVD and press input button to make a selction, make sure that the power to the DVD player is on. If yours is different try stepping through the channels buttons, some TVs input is selected through the channel buttons.

try changing the channels until you reach 2 and go past it.

Go to menu on front of tv, scroll down to source/input heading.Use the volume or channel select buttons to change the source

If you have lost the remote, go to any electronics store and buy a universal one. I have programmed many generic remote controls, and they all work fine for adjusting the video inputs. Not all television sets allow their video inputs to be switched without the remote. Most likely you will have to buy a replacement.