Here are the steps to fix a leak under the sink:
1. Determine the type of leak.
2. Turn off the water supply.
3. Clean the area.
4. Disconnect the drain from the sink.
5. Remove the locking nut.
6. Scrape off the plumber’s putty.
7. Prepare your new strainer.
8. Put plumber's putty on the strainer.
9. Install the strainer.
10. Reconnect the drain to the sink.
11. Turn on the water supply and check for leaks.
Here is a more detailed tutorial on how to fix a leaking kitchen sink . It includes pictures and more detailed explanations of each step.
I hope this helps! Let me know if you have any other questions or if there's anything else I can help you with.
