The display currency has been reset to the store default because the selected currency would display amounts as zero. Please update the exchange rate and the number of decimal places in the Multi-Currency settings.

[4 Problems] I can't see the dot instruments. How do I add them?

In MT4, press Ctrl+U or select Symbols from the right-click menu in the list Instruments.
Select an instrument category with a dot (e.g. Forex Majors).
Double-click on the instrument you are interested in to add it to the list.
Open the chart of this instrument.