positioning HTML code which shows a graphic

Hi Newbie to WP here,

Whilst creating my 1st few pages, I want to add HTML code which will display a graphic. (from affiliate schemes). Q is how do you position the code\graphic other than defaulting to Left hand side under any other text.

Ive got the code working by pasting it on the text tab.

Also how do I allow text wrap around an graphic ?

Cheers