Your English is incorrect, should read, "How do you prune an olive tree?"
You can prune it but the symmetrical shape that makes it attractive will be wrecked. If you do prune only tip prune.
If you wanted to prune a tree, you will need a Class 1 fulcrum.
prune them
winter
During the Winter.
You get a poisonous tree dragon.
I have no idea.=D
early spring
Prune it during the growing season. but dont cut off any fruiting wood unless you have to.
You will either get a poison dragon, flower dragon, obsidian dragon, lava dragon, moss dragon, or tree dragon.
Try here. http://www.sacredgardenfrangipanis.com/frangipani_growing_advice.htm