Help needed for fender bender budget sheet! Formulas

Hi All! I've been looking for a budget sheet for this year to keep track of income vs expenditure for my wife and I with pensions etc, and found a great template which is EXACTLY what I'm looking for.... Except (!) I can't for the life of me get the line items from 'Itemized Expenses' to show up in the monthly or YTD sheet?
The date on the main YTD sheet says '2013' at the top, and if I change it to 2017, the dates in the itemized sheet go to the 'text' format, and I'd like to change the currency symbols to GBP, which I can do in the 'custom' section of cell formatting, but CANNOT for the life make the 'MONTHLY EXPENSES SUMMARY' pick up the date that I've entered. I used to think I was reasonable (Excel 03) but getting old, forgetting a lot combined with being COMPLETELY out of my depth is not helping the cause!
Does anyone have a moment to tell me where I've come unstuck (other than tackling something thats beyond me!) I'd really like to try to understand it.

Many thanks indeed.

What version of Excel do you have? Workbook requires 2013 or later.

I appologise for not adding that, John, a rather important bit of information! I am using Microsoft Office 2016 (Word, Excel and Outlook). Many thanks.