See thumb in a subcatecory

[mon]

Hi, i don´t speak english good, so I´m sorry.
I have a question, i make a category, when i make a album in this category i see in the index page the name of the album a one thumb inside of the category, but if i make a subcategory and make a album inside of this subcategory, in the index page i don´t see the name of album inside of the subcategory, only see the name of subcategory, i have to make click in the category and then i see the album`s name and thumb, how can i make to see in the index page the category and subcategory albums and the thumbs of them?, thanks and sorry by my english

[Bubble]

login as admin, go to "categories" then you will see a list of your cat and subcat, click to the "e" of the subcat you want to have the image display, then under "Category thumbnail", select the image you want to disply. 

[mon]

The first. thank you so much. I know, but the problem is, there are many albums inside to the category and subcategory and i don´t see the name and thumb of the albums inside of the subcategories if i don´t click in the link of the subcategory, you know?, in this moment i see the name of category father, its thumb and the name  and thumbs of the albums inside also i see the name of the subcategorys but i don´t see the names and the thumbs of these albums there are inside the subcategories. You can see the sample here http://ciclosjogar.com/kike2/index.php. MOUNTAIN BIKE is the category father and you can see the name and the thumb of the album there are inside, also you can see Año 2006 and Año 2005, it´s a subcategory and inside of Año 2005 there are one album and i do´nt see its name and i don´t see its thumb if i don´t click in the link and open this subcategory. I hope you understand me and i hope explain good, sorry for my english. greeting