I want to recruit affiliates for my book and I read that you must contact the people on the blogs, squidoo and etc . How do you get in touch with them through email ?
Use their email address. If you don't have it, look on their blog for it. If it isn't there, see if they have a contact form instead. If they don't, move on to the next blog.
Look for their contact email address in the 'about' pages of the blogs if the blog has one. Usually they have contact form plugin installed there you can put your message to the blog owner.