how can i invoke the spirits?

First 你 need to prepare and sterelize your cicrle, spirits will not come unless 你 显示 them the right respect, and nothing better than being clean. Light a white candle and walk the outer-ring of the 圈, 圈子 calling on the elements and if 你 wish, light a stick of incence.
There are two ways 你 can try, Ouija 或者 Scrying.

Ouija - if 你 don't have a ouija board, 你 can cut squares of paper, one for each letter of the alphabet, 1-10, and yes and no answers. Arrange them in a 圈, 圈子 and use a glass as the pointer. Then all 你 have to do is ask if any spirits wish to make contact and go from there.

Scrying - sitting in front of a mirror 或者 a clear bowl of water. 你 have to concentrate very hard for this as 你 need to 'open' the mirror into the other world a bit like a doorway so the spirits are able to come through. Then all 你 do is talk to the spirits through the water/mirror like an everyday conversation with another person. However 你 need the atmposphere to be very quiet, so no ticking clocks 或者 buzzing of the computer, no background 音乐 as these can all make your concentration waver and also make it 更多 difficult to hear the spirit.
你 need any 更多 help 或者 step-by-step instructions just message me :)

What the heck does the word invoke mean? If u mean get rid of them seances, saige, rituals, and 更多 get rid of em.

Go watch Danny Phantom.

Spray some "Be Gone Spirit" spray.

Go to the cemetery and kick headstones and dance on plots.
That will certainly invoke them.
But I suggest 你 don't do it.

Are 你 insane?
This is so dangerous!
Please dont do it!
你 can get a trauma! O_O

Laugh at them. Diss the dead. Preferably alone, in a dark room, and assuming 你 own a Ouija Board, you're gonna die for sure.

I MEAN. Invoke some spirits.

Go out in the 街, 街道 at night and yell, "YO, SPIRITS! I NEED Y'ALL! COME OVER HERE!".

With Google.

I'm not sure that's a good idea.
Good luck if 你 do meet them and try not to anger them.

Go to a graveyard, and play 'Never Gonna Give 你 Up' at 2:00 A.M. in the morning continuously. That will get them really pissed, causing them to come out from hiding. When they're out, spray deodorant in their eyes, while 唱歌 'Look At Me Now', and they'll get so mad, they'll commit suicide twice.

R u trying to call them
或者 get rid of them