Here are some steps to follow to unclog a sink:

1. First, try using a plunger to remove the clog. Make sure there is enough water in the sink to cover the plunger cup, and then place the plunger over the drain opening. Push and pull the plunger up and down rapidly, creating suction to dislodge the clog.

2. If the plunger does not work, try using a plumbing snake. A plumbing snake is a long, flexible tool that can reach deep into the drain to remove the clog. Insert the snake into the drain and turn the handle clockwise to move it forward. When you encounter resistance, turn the handle counterclockwise to loosen and remove the clog.

3. If neither the plunger nor the plumbing snake works, you can try using a natural remedy to dissolve the clog. For example, you can pour a mixture of equal parts baking soda and vinegar down the drain, followed by boiling water. The chemical reaction between the baking soda and vinegar can help dissolve the clog.

4. Another option is to use a commercial drain cleaner. Be sure to follow the instructions on the label carefully and use protective gloves and eyewear. Some drain cleaners contain harsh chemicals that can damage pipes, so use them sparingly.

5. If none of these methods work, it may be time to call a professional plumber. They have the tools and expertise to remove even the most stubborn clogs.

Remember, it's important to be cautious when attempting to unclog a sink. Never pour boiling water or harsh chemicals down the drain if you suspect there may be a blockage in the pipes, as this can cause damage. If you have any concerns or questions, don't hesitate to reach out for professional assistance.