How do I remove all ads from my theme and reaply for google adsense

Good day, The theme I’m using has been monetized, please I need help on how I can remove the ads. I have been seeing different ads including google and Jumia ads…I want to remove the ads and apply for mine.

It will be very easy to remove all of them if you used a plugin to place the ads on the blog…

I didn’t place the ads myself… I saw different codes on the html code.

Or can I use plugin to add google ads?

Sure, if you are on wordpress