I've uploaded my first digital game to my page and some people have asked for it to be made claimable, which I'm happy to do, only I can't find a single button/checkbox/option etc in the game settings or my settings to make it claimable. Where do I go/what do I need to do to make it claimable?

[In case this is relevant, as I've seen it mentioned in some posts about claiming: all my games are currently on a 100% sale during lockdown; it would otherwise be $1. I've no idea why this would affect things, but just in case it does...]