New to VBA - Need help moving forumla result to new field and setting a refresh field

I am trying to create a spreadsheet where vacation accruals are calculated, and then moved into another cell. I can create this with a formula in the receiving field and then set a circular formula so that it never changes. The problem is that the HR staff member who will use this spreadsheet is not strong with excel and will want to make changes so that accruals show for future months. Once she changes the dates in my spreadsheet she won't be able to clear the future months to be recalculated when the actual date arrives. I thought a macro might help me to do this, but I am not familar enough with them to do this on my own. I have attached the spreadsheet with the names changed so you can see what I am trying to do. I appreciate any assistance in making this happen. The month that changes is in F1. I haven't done anything about a refresh button.