How do I install steel legs on a wooden table top for a table?

Joan, the blending of wood and steel together always makes a pretty piece of furniture. See if these videos help you.

https://www.youtube.com/results?search_query=steel+legs+on+wood+table

From the bottom you could screw/bolt them onto table, or metal bracket that attaches to table then the legs screw into the bracket. Bracket set https://www.amazon.com/Dreamtop-Mounting-Furniture-Attachment-Couches/dp/B0756VNDHX/ref=asc_df_B0756VNDHX/?tag=hyprod-20&linkCode=df0&hvadid=216708290339&hvpos=1o1&hvnetw=g&hvrand=3312350982165585286&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030040&hvtargid=pla-376621097962&psc=1 Word of caution......This style-Hairpin-can be very dangerous I know someone who's puppy got their head/neck stuck in it while my friend was at work and almost died from being strangled https://www.google.com/search?q=hairpin+legs&rlz=1C1CHBF_enUS750US750&source=univ&tbm=shop&tbo=u&sa=X&ved=0ahUKEwjslOuH4L7gAhWULH0KHZa-CMEQsxgIjAI&biw=1366&bih=657 OR here are bunch more choices http://www.craftsmanspace.com/knowledge/17-ways-to-fasten-a-tabletop.html

Pick the nicest part of the table that you want on the top then put the legs on the bottom