Most of the ファン have marked some of their クラブ 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 クラブ with colors. Members who have a spot coloured have gained a MEDAL for that specific spot. あなた get a medal によって adding stuff to the spot such as videos,images & picks. You`re likely to get a medal when the the content あなた add is non repeated and people actually rate it.

Those are medals. Read link