Advice on access database

I need help with a database that i am trying to create.? I dont know where i have gone wrong or how to fix it.? I am new to Access so i need someone that speaks a language that i can understand.? I have never tried using code in access as i stick to the wizards so offering a list of code will just confuse me to death. My database has been designed to input details on skillseeker trainees, which college they attend, who employed them, where they stayed, when they started and finished etc but its not working.? I cant input trainee details until i input placement details and i cant input placement details until i input trainee details??????????