If you have cut your finger, it's important to take immediate action to prevent infection and promote healing. Here are the steps you should follow:

1. Clean the Wound: Rinse the cut under clean, running water to remove any dirt or debris. Avoid using soap directly on the wound as it can irritate it.

2. Stop the Bleeding: Apply gentle pressure with a clean cloth or bandage. Elevate the finger above the level of your heart to help stop the bleeding.

3. Apply an Antiseptic: Once the bleeding has stopped, apply an antiseptic ointment to help prevent infection.

4. Bandage the Cut: Cover the cut with a sterile bandage or gauze. Change the bandage daily or whenever it becomes wet or dirty.

5. Monitor for Infection: Keep an eye on the cut for signs of infection, such as redness, swelling, increased pain, or pus. If you notice any of these signs, seek medical attention.

6. Seek Medical Attention if Necessary: If the cut is deep, won't stop bleeding, or if you haven't had a tetanus shot in the last five years, you should see a healthcare professional.

Remember to keep the wound clean and dry, and avoid using the injured finger for heavy tasks until it has healed. If you have any concerns about the severity of the cut or your ability to care for it, consult a healthcare provider.