First, a little housekeeping. How to meditate with ADHD myths about meditation and the myths about meditation that put people off are knotted together, and nobody tells you that up front. Most people quit before the first week ends because somebody swore the goal is an empty head. Wrong. A brain like yours was never going to go silent on command, and that's totally fine.

The blank-head fib
Here's the big one. You sit, close your eyes, and thoughts vanish like steam off a cup. Not a chance. Thoughts keep showing up, even for people who've practiced for forty years. The actual skill is catching yourself mid-wander and stepping back. Every return counts as one rep, like a bicep curl for attention. Lost the thread forty times? Nice, that's forty reps in the bank. Take a bow.
Begin absurdly small
Toss out the twenty-minute rule. Go for a minute and a half. Set a timer, because clock-watching is a trap for a restless mind. Pick a single anchor, such as the weight of your feet on the floor or cool air slipping past your nostrils. When your brain sprints off to tomorrow's to-do list, mutter "ah, there you go" and come back. Don't nag yourself. Scolding only piles a second problem on top of the first, and you've got plenty on your plate already. Add thirty seconds next week, or don't. Plenty of people stay at two minutes for months and still feel the difference.
Let your body have a say
Then there's the myth that you must sit frozen like a statue. That rule chases plenty of fidgety people right out the door. Try a slow walk instead. Feel heel, arch, toes, repeat. Or hold a smooth pebble and trace its edges with your thumb. Swaying in your seat is allowed. So is a fidget ring. A woman I once met did her finest sessions folding towels. Nobody gave her a medal, but she stopped skipping days. A calm mind doesn't depend on a frozen body, and for a lot of us, movement is the very thing that gets us through the door.
Silence can feel like a room full of toddlers
A guided recording hands your brain a voice to follow, which cuts down the odds of vanishing into a daydream for ten minutes. Grab one with short prompts and tiny gaps between them. Once that feels easy, stretch the pauses a little. It's basically training wheels. Nobody mocks a kid for using them.
It's supposed to feel peaceful, right?
Nope, wrong again. Some sessions feel itchy, dull, or weirdly emotional. That's data, not a flunk. Some days you'll stand up calm. Other days you'll stand up grumpy and quietly proud that you showed up at all. Both count. Tie the habit to something you already do, like pouring coffee, so you don't need willpower you won't have at 7 a.m. Dropped off for three days? You're in good company. Sit for ninety seconds today and call it even.