You tried to post this same question in many areas of the forum—don't do that. Next time you have a question, post it ONCE in the correct subforum, please, or else you're creating a lot of work for the moderators.
I'd dress the candle from top to bottom with the oil.
It sounds like this is the spell you're referring to, posted by starsinthesky7 at the top of this thread:
"I got a black woman figure candle, and carved out the lower part of the stomach where the uterus would be with a nail. I used pennyroyal because it isnt good for people trying to get pregnant. I put red, black pepper, and goofer dust. Then I filled the area back up with wax, and melted it down, and let it get hard again. I then dressed the rest of the candle with a jinxing oil such as crossing, destruction, or black arts oil. I put red pepper, sulphur, black walnut leaves, and knot weed on the outside of the candle. Then I took a heated rust nail, and stabbed it through the uterus part where I had packed the previous herbs."
Trying to find a shortcut is not a good way to go about doing magic. It sounds like you're wanting to get results with the least amount of effort possible, which will likely make your spellwork unsuccessful in the first place. If you want something big to happen, you have to put in the time and effort, sorry. Also, this is some very heavy, dark work—I hope you've made sure it's justified in the eyes of God before attempting it.
You could hire a rootworker to do this work, but it would be up to them whether to take it on. You can find reputable workers here:http://www.readersandrootworkers.org
Thank you, St. Michael, St. Expedite and La Santisima Muerte!