Now that I have created a club... I tried to উঠিয়ে রাখুন a picture for the banner.... am I stupid....or how do I do that?!

There's a button on the left side under the "You're a Fan!" button that says "Edit Club". Click on that to add a banner and প্রতীকী to the club.

আপনি need to have sufficient powah to see the সম্পাদনা button, but if it's a new club that আপনি created, আপনি should be able to do it.