someone talk me through removing mold from bathroom walls?

On tile and grout, a bathroom mould spray or diluted bleach (roughly 1 part to 10 water) - leave it 10 minutes, scrub, rinse. On painted walls, wipe it off with a mould cleaner, let the wall dry right out and repaint with a mould-resistant bathroom paint. Never mix bleach with vinegar or ammonia cleaners, and keep a window open while you work. It will come back unless you fix the moisture though. Run the extractor during every shower and for 20 minutes after. No extractor? That's the real job.