To make any herbal tea with fresh leaves, pick a couple of stalks, remove the leaves and muddle them.
(Muddle=bruising them gently to release their flavor)
You can use a mortar and pestle, the back of a spoon in a bowl, or just rip them up and smush with your fingers. This releases the essential oils which provide the flavor. Put them in a cup, add water slightly cooled from boiling (not still bubbling). I steep 5-10 minutes. Unlike black tea, longer steeping time doesn't result in that unpleasant "stewed" flavor.
I've used a lot of words for a very simple process. It's no different from brewing any (dried) loose-leaf tea, but you need more plant material when it's fresh. I recommend an open-top strainer rather than a small closed tea ball to allow better infusion, or just put it loose in the cup or pot, then strain. Nothing about this is a rigid rule. Feel free to experiment.
I didn't finish my large cup last night and put it in the fridge. Highly recommend it cold!
Or
Two different strainers