Insert into?

[short]

I have three tables made into a many to many relationship:

SoftwareX, Softwarex_NameofService, NameofService
SoftwareX and NameOfService holds data, SoftwareX_NameofService holds the
primary keys between the two.

On the SoftwareX form, I want to create a button to open the Name of Service
form only if that software needs the service. When the user hits the button I
want to put in the softwarex_NameofService table the SoftwareX primary key,
and do the same when the NameofService form is closed.

Can I use an INSERT INTO statement? and how would I do that?

Thanks