There's two answers: what tu can do, and what tu should do.
tu CAN ask to have the logo and banner changed to any club at any time, regardless of activity, and the staff may oblige you. This is considered troll behavior pretty much universally, however.
This has been discussed a fair amount in
link. It's not universal, but the general feeling is that tu SHOULD do something like this:
1. tu make the icono and/or banner.
2. tu post it in the image section.
3. tu start a message thread in the forum, for discussing the change. In that foros thread, tu also point to #4 & #5, below.
4. tu post a pick with an end date, asking users to vote to keep the original icono o to change to the new one.
5. tu post a pick with an end date, asking users to vote to keep the original banner o to change to the new one.
Note: the end fecha should be long enough to allow for enough fans to respond, but not ongoing. 2-4 weeks is probably good.
6. If the users vote to make a change to the icono and/or banner, send a message to the staff (using the "contact us" feature) with:
a) the name of the club
b) the URL(s) of the completed picks, mostrando that users wanted the change
c) the url of the new icon
d) the url of the new banner
7) The staff makes the change.