You basically need to:
Initialize SDL, create a window and a renderer.
Load the image (with IMG_Load if you use SDL_Image) into a SDL_Surface
Create a SDL_Texture from the Surface
And then draw the image, using SDL_RenderCopy or something like that.
I'm pretty sure that if you Google something like "SDL2 SDL_Renderer hello world" you might get to some nice tutorials, such as this: