First inversion of a C Chord: If you count up three keys from E, not including the E key, you will have the second note of an inverted C chord, which in this case would be G. From the second note, which is G, count up another five keys, and you will land on the third note, which is C. Thus you have E, G, C, the first inversion of a C chord. Note how with the original C chord, where C E G were the notes and the C was on the bottom; now the C is on the top with the E G C inverted chord. Apply the rules 5 + 4 to get the second inversion, this time starting from G. This applies to any key and any chord. Hopefully I cleared it up for you, if you need any further explanation holla at me.