Universal remotes may not be any good to access the TV menus as they usually only provide common functions like channel-changing, volume, standby etc).
If there are no buttons on the TV to access the menus, you'll have to contact the TV manufacturer to see if they can supply a replacement remote.
It's common practice nowadays for TV manufacturer's to consign all menus & adjustments functions to the remote, this simplifies and speeds up the TV manufacturing process. Pretty much all you get on the TV is a button for power on/off and that's it (mine's like that).
Absolutely no way to do anything else on mine without the remote, so you've got to look after it!