Pixel enlarge

[al.da.drone]

Hi all, I am trying to get my head around Gimp and graphic software as a whole and clearly I am a bit thick on the subject so I appologise in advance for my question.   I have an image that is 226 x 223 pixels, a website says that is an option in Gimp that will up the quality when I scale it. Low and behold the option isnt available in the Gimp I'm using. I have attached a picture. Is it somewhere else in Gimp?

Thanks