How to change the input
First, the bad news: Unfortunately, you are correct - the only button to change inputs is on the remote, which you no longer have.
Now, the good news: You can buy a universal remote, set it for your TV model, and have control of your inputs again. The first link below is for the URC R6, which is available at any Walmart for about 20 bucks. You can set it up for an Emerson TV, no problem. Here's the link for it:
http://www.universalremote.com/consumer/products.php
Also, here is a link for the owners manual to your Emerson EWF2703, in case yours has gone missing with the remote:
http://www.emersonaudiovideo.com/pdf/om/EWF2703.pdf
Not a perfect solution, but it will work, and it will work just as fast as you can get to your local Walmart or equivalent.
Cheers
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