Making perfume with fragrance oil is a simple process. Here's how to do it:

1. Gather your materials: You will need fragrance oil, alcohol (such as vodka or perfumer's alcohol), and a spray bottle or bottle with a rollerball applicator.

2. Choose your fragrance oil: Pick a fragrance oil that you like. There are many options available, ranging from floral to citrus to spicy scents.

3. Mix the fragrance and alcohol: In a small container, mix the fragrance oil and alcohol in a ratio of about 20% oil to 80% alcohol. The exact amount will depend on the strength of the fragrance oil you are using, so you may need to adjust the ratio accordingly.

4. Store the mixture: Let the mixture sit for 24 hours to allow the fragrance to fully mix with the alcohol.

5. Transfer to the spray bottle or rollerball bottle: After the mixture has been stored, transfer it to your desired bottle, either a spray bottle or a rollerball bottle.

6. Enjoy your homemade perfume: Spray or roll on as desired.

Note: It's always important to follow the instructions and warnings on the fragrance oil packaging, and to store the perfume properly to ensure its longevity and safety.