You will need to look up Refresh, Requery, RePaint, RepaintObject and referring to Objects and Variables on a form in the Language Reference.
You need to understand how the syntax works, ie:
[Forms]![FormName].[Form]![VarName]
[Forms]![FormName].Requery
[Forms]![FormName]![VarName]
[Forms]![MainForm]![SubForm].Form!FieldName.Refresh
[Forms]![MainForm]![SubForm].Form.Requery
If you want to update a Table, run an Update Query.
No point in doing it all for you, it won't help in the understanding. I'd advise you to read through the Language Reference. Might be a bit boring but is essential at some stage.