Help Populating a Link (junction) table

Hi there

I am learning (or trying to teach myself) Access.

I have come to a bit of a stumbling block. I have generated a dummy training company where trainers teach IT subjects. My 3 tables look like the following...

TrainersTable
(pk)TrainerID
TrainerName
Contact


Course Table
(pk)CourseID
Course Name

JunctionTable
LinkID
(fk)TrainerID
(fk)CourseID


etc etc.

The Junction table is there for a many to many relationship.

I have created a form which has a drop down list for the trainer and the course but at the moment, they are Unbound. How can I make them attach to the relevant fields in the Junction table?

Will I need a button to save the entry once I have selected a trainer and a course?

Can anyone give me a nudge in the right direction?

****BEGINNER WARNING****

Muchas Gracias people

Simon