Affiliate Marketing Secrets

Hi,
I’m rewriting the content for my lead generation property website which is voluntarily down (because the current host is in Indonesia or somewhere and load times are pathetic!!).
For my new content and site, I have been asked to add the key phrases into the content of the site but just cant seem to put the phrases in because they are grammatically incorrect (even so, they are the most searched for phrases in the niche i work).
Does the phrase in the content have to match EXACTLY or can i change “Sell House Now” to “Sell MY House Now”?
Any help would be great!!!!!
Thanks