If you joined, you should have been given an MM# for yourself, which is what allows you to contact models by THEIR MM#.....it's all internal. The only other way to contact them is if the model happens to list a contact email address OTHER THAN Model Mayhem in his/her bio page.
OK, let me make this easier.....go to MM's homepage,
www.modelmayhem.com; at the top, you will see several tabs that link you with various things on the website. Look for the tab called "Browse." Click it. On the following page, you'll be able to start choosing from various dropdown boxes. The first dropdown lets you choose the artist type. If you're looking for a model, with your cursor, select "Model." The next one lets you choose Male or Female. Underneath the gender, you can select one of two options: either view only the name and photo OR get complete details which will include a photo of the model, where they are from, and every other bit of information that the model chooses to list, including other photos they allow you to see. Under that dropdown is one that lets you choose the activity level the model has on MM: new, last activity, recently updated, longest on MM OR if you happen to know the name of the model, you can type it in. Next, you can choose the location; for example, if you live in Orlando, Florida, with your cursor select "Florida," and then you can select Orlando OR you can type in your zip code and also select a viewing of models that live 5 miles from your zip code, or 10 or 15 or 25 or 50 or 100 miles. Finally, you'll have to type in the security phrase that you see so MM's computers can make sure you're not entering the site with a virus or something. And that's it. It sounds like a lot of steps but once you do it a couple of times, it's a cinch from then on.
When you get to the model's portfolio page, you can click on a link directly underneath his/her picture that will take you to the photos he/she has included for viewing. When you get to the photo page, each photo can then be enlarged for better viewing, simply by putting your cursor anywhere on the photo and then clicking.
One final thing about the photos, many models will choose to keep their photos private unless you are an MM member. If you're just there browsing, you won't see any image at all and it will tell you that the photo is for viewing only by MM members. But, if you ARE a member, then EVERY photo will be available for you to see and that means you'll have to login with the MM# you were given.
Happy hunting!