Cheat

First Press F12 button to type the cheat codes

Here's The Code :
vatican    : Add 6 diplomats
dagama     : Add 6 merchants
pocahontas : Add 6 colonists
drake      : increase naval technology
gustavus   : increase land technology
polo       : increase trade
russianhordes : Add 1000 army
montezuma  : Add 50.000 coins
peterthegreat : unlimited army
alba       : decrease rebel in province

More Codes

You can edit the xxx.eug file (xxx denotes filename) found in the saves directory using the wordpad application. Scroll thru the lines until you come up to your nation/side. Pay attention to { and } symbols when doing this edit.

Keywords: 

treasury: edit money (limit is approx 2 billion) 

city: edit city name, population (max = 999999.000), infrastructure. City must at least 
have level 1 wall. Fully developed city has following lines: 

city = "name"
population = 999999.000
location = xxx (xxx = number)
courthouse = yes
bailiff = yes
cityrights = yes
fortress = {...level = 6} 

land unit: edit name and number of infantry/cavalry/artillery each land unit has. 
Watch out for artillery, not too many. I prefer the following combination 30000/5000/150 (weight=50). 

nav unit: same as land unit except this one is for naval 

technology: edit all tech level. Set 51 for military techs and 10 for rest. 

diplomats, colonists, merchants, missionary: edit number of these guys (max=6) 

You can also do this dirty trick:

Set up a level 1 trading post at a neighboring state and save the game once the attempt is successful. Edit level 1 to level 6 in the following line: trading post = { "name" level = 1 location = xxx}. A level 6 trading post won't give you any rebellion problems once transformed into a colony. 

Changing this line to: city = ("name" population = 999999.000 location = xxx} will automatically transform the trading post to a fully populated colony. Warning: could inspire revolt if religion is different from yours and you do not tolerate that religion at all.