API and html code

Hi, how do i add in API or html code(ads) to my game?

I am guessing that it is not done inside construct but with a external software?

Can anyone point me to the right direction?

anyone can help? i know it is a very nooby question but i have no idea.

A few factors go into this.

1. What device will the ads be show on (mobile or web?)

2. What ad service are you using?

More questions follow after those are answered.

1. I am using it for mobile but actually it's more to both.

2. Leadbolt or mopub?

thanks!