Its very simple all you do is hit your "~" key on your top left corner under "esc".

1,000 cash -- Money
1,000 energy -- Energy
1,000 fuel -- fuel
1,000 metal -- Metal
1,000 oil -- crudeoil
1,000 rare materials -- rarematerials
1,000 supplies -- supplies
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The Finest Hour Expansion.
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You have to add the code then add then amount you want ex:

54923 metal -- metal 54923
354324732 energy -- energy 354324732

On TFH expansion you can edit how much manpower you have by inputing the code the same way as you did with the others,
65495435 manpower -- manpower 65495435

+1% more officers -- addofficers
Instant research -- instantresearch
One day unit production and building construction -- instantproduction
Toggle fog of war --debug fog
Toggle superior espionage -- debug spy
Toggle AI favorable response -- debug yesmen
Zero neutrality -- noneutrality
Trigger indicated event -- event [event code]
Trigger revolt to indicated province; repeat to add more rebels -- revolt [province ID]
Annex Nation -- surrender [enemy's tag] [your nations tag]

The code to changing country is -- tag [countryinitials] for ex" tag ROM <- Romania
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here is some that i know

Romania -- ROM
Great Britain -- ENG
Germany -- GER
Brazil -- BRA
Argentina -- ARG
United States -- USA
Japan -- JA.P <- sorry steam wouldnt allow the full word :x
Sweden -- SWE
Norway -- NOR
Russia -- SOV
~The rest are pretty easy! happy cheating :D