how to remove spam macbook pro

Please be more specific. What are you seeing that you consider "Internet spam?"

Adware? Manual method.

Malware – Adware removal – Apple Support

Or download this program which was written by Thomas Reed, a long time poster. The program will do the work for you which makes it easy. If you are uncertain about downloading programs, try the manual method.

Malware Guide – AdwareMedic – 10.7 and higher