Assign values to textbox within userform based on combox selection.

I have a userform that I want to display data from a complex table based on what month is selected in a combobox. Then, once that data is displayed, I want to be able to manipulate that data within the userform - all changes must be saved into the table where the data was originally derived.

Can anyone help with this?

I've attached a workbook that shows what I am working with.

I would also like to change the background color of the text boxes so that users know which ones can be manipulated.

Thanks.