I'm trying to make a calendar, but i don't know how to do it. i've tried following the 'the calendar conumdrum solved in filemaker pro'-guide, but i can't get it to work... Is there any simple, spelled out guides available?

What i want in the end is a calendar who is linked to my customer profils, so i can make the appointment under the customer profile, but stille have all the customer appointments in my calendar...

Calendar/appointment solutions are pretty complex, but we've had some discussions about them in the past. You might search for "+scheduling", "+calendar", "+appointment", or "+events", or various combinations of those keywords (without the quotes, but with the +), and see what comes up.

If you want a module that's already complete, check out the CC Calendar apps from http://www.clevelandconsulting.com/