Squeaking or popping sounds could be a blunt needle so make sure you change it regularly, 4-6 hours sewing time is rule of thumb.
To find where to oil this machine download the manual from
http://www.singerco.com/accessories/manuals.html, just type in your model number into the search field and click 'Search', most of the manuals are there as a downloadable pdf file.
The manual will show oiling points for your machine. Use sewing machine (clear) oil only, a little drop only but oil and clean regularly to get the best performance. Brush out any lint and dust first (don't use compressed air to blow a machine out, much better to brush out carefully with a little brush and remove the lint from the machine).
You can also put a drop of oil onto a piece of waste fabric then rub this up and down the needle bar (the metal part that goes up and down holding the needle) to keep this clean and lubricated.