I am including some links below which will help you do this, and also may clear up some other problems.

The link on How to label, change or hide buttons will tell you how to change the component name. It is the 5th paragraph down. I was going to repeat it here but it is very long, so you can go to the link

The reason your receiver won’t turn on is because it is still in AV2 mode. The link below will tell you about that.

If you want to make a macro on the DVD button: (Macros made on buttons or labels will always end up on that button, no matter which device is pressed last, while macros made on system control keys or labels will end up on the last device pressed)
Commander off/muting
System
Press the DVD (or whichever) button
Press DVD again
Select either Power On or Play (either will turn the DVD on)
Press the TV button
Press the button which changes the input to DVD
Press the AMP button (or wherever your receiver is)
Press the button to change the audio
Exit

These threads will answer your questions, and others which may arise.

RM-AV3000/3100 NEWCOMER’S PACKAGE-WELCOME-CHECK THESE OUT (IF YOU HAVEN’T ALREADY DONE SO) AND SAVE YOURSELF SOME PROBLEMS

AVOID SYSTEM CONTROL PROBLEMS

HOW TO LABEL, CHANGE OR HIDE BUTTONS

CHANGING BATTERIES (May not apply to RM-AV3100-time will tell)

AND IF YOU HAVE A SONY RECEIVER:
CHANGING YOUR RECEIVER AND REMOTE TO AV1 (or AV2) COMMAND MODE