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how to edit nintendo presents screen?

title says it all.
If you'd like to just edit the look, you can press the #lm{extgfx} Quick Extract GFX From ROM button, and use a graphics editor to edit the logo. It's in GFX00.bin. Save the file, then press the #lm{insgfx} Quick Insert GFX To ROM button when you're finished. (Note that the logo uses Palette 8, which is the one Mario uses.)

The sound effect is at SNES address $0093C1, which can be edited using a hex editor. The list of sound effects are
Unless you've used AddmusicK on your ROM, then it'll be treated as song 1E in the AMK list, rather than a sound effect.

There are other options to customize this screen, like the Nintendo Presents Logo Expansion v1.3 which makes it a 64x64 logo, or the 8BPP Nintendo Presents Screen which allows you to use a custom fullscreen 256-color image.
Originally known as A Yoshi (2006-2009), Aquifer (2010-2011), and Azurik (2012-2014).