Most of the 팬 have marked some of their clubs with colours red=fanatic,yellow=die hard fan,green=deticated fan.How can I do this to some of my clubs?

No. Actually it`s not about a certain member "marking" the clubs with colors. Members who have a spot coloured have gained a MEDAL for that specific spot. 당신 get a medal 의해 adding stuff to the spot such as videos,images & picks. You`re likely to get a medal when the the content 당신 add is non repeated and people actually rate it.

Those are medals. Read link