How to get rid of McAffe Ads

young annoyed female freelancer using laptop at home

HELP!!!!!!!!!!!!!!!!!!! I have been invaded by McAfee antivirus advertising and I can't find  a way to permanently block or elimiate them. I personally do not like McAfee and or their pricing. I already have an antivirus program I like and use frequently. How in the heck do I end McAfee so I don't have to deal with it again? 

Is this legit?

person holding iphone showing social networks folder

I had to get a new phone. Since restoring from backup my apps and data, I am receiving from constantly alerts that I have won all types of stuff. I have not clicked on anything. I want to know if this is a legitimate website. If not, is there a way to stop receiving these alerts?