Pour some rubbing alcohol on a cotton ball and wipe down the jar to remove any invisible fingerprints and oils from your hands.
Mix your bottle of Dishwasher Safe Mod Podge by gently rolling it back and forth. Violently shaking the bottle will result in air bubbles you do not want.
Lay out flower and greenery pieces you want to incorporate into your project. You may not use all of them but it is useful to be able to see what you have to work with.
With your tweezers, pick up a piece of greenery and lay it up against the jar to get an idea of its size. These dried flower pieces are very fragile, so it's best to always use tweezers.
Use your paintbrush to apply mod podge to the area where the greenery will go.
Pick up the greenery again and apply it to that area.
Gently pat the greenery onto the mod podge so it makes solid contact with the jar.
Apply a thin coat of mod podge on top of the greenery.
Add in more greenery. You can snip off any long unruly stems as needed.
Keep adding greenery until you have a nice spacing of ferns and/or leaves over the jar.
Start adding flowers in the same manner. These will most likely be overlapping some of the greenery, but they don't necessarily have to.
Keep going until you feel you have a good amount of flowers and greenery on the jar. It's easy to go overboard, but the final look is totally up to you.
Once you are done applying your dried flowers to the jar you will want to let the jar sit for 1-2 hours. Then apply 2-3 topcoats over the sides of the jar top to bottom (even where you have no flowers). Allow for 1-2 hours of dry time between coats.
I'm using my glass jar as a candle holder or lantern. Since the jar is enclosed I'm using a battery-operated LED candle so it won't get too hot. I have a link to the candle up in the supplies list. It's actually part of a 3 piece set of LED candles in pretty glass holders and they have realistic-looking flames. They're my latest obsession.
Notes
Adding 2-3 topcoats with 1-2 hours dry time between coats is necessary to the success of your project
Your project MUST cure for 28 days before it is dishwasher safe