How to upscale?

. I've found the option, but it's greyed out, any idea how? Just as the title says,

This question has come up recently, here's my answer: https://civitai.com/questions/1816/how-to-upscale-an-image-i-can-see-it-in-the-feed-but-can-not-use-it-thx In short, you need to wait, it's an upcoming feature.