wether i needed to write to the voice actor or just the muppets studios for a PP of Kermit

No idea what you're actually asking; if you want something signed by "Kermit", just do it yourself, as "Kermit" isn't real.
If you want Steve's autograph, then write to him.

Hi,
This is prob a stupid question

i want to collect the Extreme Makeover home edition teams autographs and Kermit was a Guest host on 1 episode (as the little kid was a fan) and i was wondering if i could write to the muppet studios and get a picture of Kermit which is "signed" by Kermit

if i was to do this who do i write the letter too just Muppet studios or the actual voice actor?

thanks