The simplest approach is probably to use the form wizard to create a form based on the table. If you only want to use this form for adding records, you can set its Data Entry property to True (Property sheet > Data tab) but the downside is that you would only be able to use that form in one fashion, which is to only add records. That might lead to the newbie approach of a form to add, and a similar form to edit - not good. On top of all that, what you probably need is a main form that displays membership details for one member at a time and a subform that shows dues transactions for that member. If all of that is news to you, I think you should research the web or read a book on Access basics (you don't mention forms in your post, so I'm assuming you're adding records via tables, which is not a good thing beyond initial db design and testing).
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.