To add Обои to your Вопрос Ты click the "add an image" button. If Ты are talking about adding pictures to the spot, go to the image section & click on the "add an image" button on the right. To add an icon/banner to a spot Ты have to be the creator of the spot & click the "edit club" button on the right side under the banner & scroll down & upload.
To answer your 2nd question, no, I don't want to Присоединиться your animal club.
If Ты add 1 или a couple of pictures it should taken under a minute. If Ты are uploading 20 it takes a couple of minutes, normally less than 5min. It depends on how fast the site is running.