promote my kooday keywords help please

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Hi i joined kooday about 3-4weeks ago i have puchased keywords and sold and rebrought myself aswell as others buying i added some keywords to my links but cannot see a benefit from this my keywords at present are value about 10dollar totals,but i am not earning anything in my paypal balance am i doing something wrong?Am i right in thinking i promote the sites my keywords are linked to aswell?also once you have linked a word to a site of your own is there any way to unlink it ?sorry to be a pain but the kooday help is very limited in its explanation.