Question about forum

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Oke guys hello i have some Questions About something i wanna do first ill put Pic :




oke this forum is in Hebrew so dont try to Read it if u can see the Title of the window i want to make the letters size Smaller because its really big and ugly some one can tell me how can i do that ?

more thing if i want put background pic on the categories bellow how can i do that ?


Thanks alot for all the Helpers