Trainer options:
F1 - Infinite Funding
F2 - Infinite Research Points
F3 - Infinite Fuel
 

Notice:

First start game world then open the hanger or main construction building then activate the research and funds cheat then close it then open it again.

For fuel you must first start an engine and once fuel is starting to go down activate the cheats.

• Kerbal Space Program: Trainer +3 v1.4.4.2215: x64 {MrAntiFun} [2018-Jun-27]