Gently pour warm water in the empty candle cup to melt any residual wax, then use a paper towel to clean the inside. Do not use boiling water as this will damage the tealights cup.
Before placing inside, check the cup for any cracks. Don't use it if you see any visible damage.
Simply place the refill directly into the cup and light it. Now, sit back and enjoy!
Feel free to reach out if you have any further questions or need assistance.