Charging a Sigil
Write it on a flammable surface and set it on fire (I favour bay leaves)
Carve it on a candle and let the candle melt (you can pick the candle colour according to the spell/wish)
Carve it on a surface with a pyrograph/something hot or carve it on something and put it close to fire where it can charge up.
Draw it on a firework and set it off.
Draw it at the bottom of a tea light and put the candle back in.
Draw it on a windchime and hand it up.
Make prayer flags with the sigils on them, or a simple flag that’ll blow in the wind.
Draw it on something light and non-polluting and let it go with a gust on wind.
Draw it on a balloon and pop it.
Draw it on a paper kite and let it go in the wind.
Draw your sigil on a soluble material and let is dissolve, it’ll also charge the water or draw it at the bottom of your cup and it’ll charge both the water and sigil.
Draw it on something non-soluble like a rock and let it soak or even throw it in the river;
Draw it on yourself when taking a shower and let it wash off.
Draw it on the shore where the water will wash it away.
Draw it on something from nature (so as not to pollute) and bury it.
Charge it with a crystal grid/previously charged crystals
Draw it on the earth.
Draw it on the leaf of a plant.
Place it in the sun or moonlight and let it soak it up.
Draw it with a glow in the dark paint.
Draw it on something that’ll disappear like fog on a mirror, lemon juice, ultraviolet pen and such.
Your own Energy:
Meditate on your sigil by focusing on it while you direct your personal energy into it.
Have it near you or on you during sex or masturbation.
Draw it on yourself and dance, sing, workout.
Have it on or near you during extreme pain or emotional states (anger, joy, sadness, etc.)
Draw it with your blood/drop some blood onto it.
Place it on a charging device (phone, computer)
Place it on speakers and blast music that matches the intent
Sing/Play an instrument to it
Draw it on the sole of your shoes
Draw it on/near a grave/with grave dirt/anything symbolic of death
Post it on a website such as tumblr where likes charge it and reblogs cast it.
Draw it on paper and tear it up
If you have your own way of charging sigils, do tell me, I am curious, and I’d like to add to the list, since this is in no way the only ways of doing so.