Go to settings>content>nsfw content and the sliders should be right there. As far as I know though this only effects what you see through the app, you need to make sure that you have nsfw enabled on your home instance via the web too. There’s a chance you may even be a user of an instance that doesn’t federate with NSFW instances so I can only really get you as far as the Memmy settings confidently
Please enlighten me! I‘ve allowed everything, but I can‘t find communities such as lemmynsfw.world
Go to settings>content>nsfw content and the sliders should be right there. As far as I know though this only effects what you see through the app, you need to make sure that you have nsfw enabled on your home instance via the web too. There’s a chance you may even be a user of an instance that doesn’t federate with NSFW instances so I can only really get you as far as the Memmy settings confidently