Strumming
From "Dakota" to "along": Em and G chords = Strum down on the top 2 strings, then all of them.
"To Chaddy's awesome birthday song!": D chord = DD DDD
"Chad, Chad, Chaddy, Chad, Chad": Em chord = DD. G chord = DUDU 

NO CAPO

    Em                        G
Dakota, it's your birthday and it shouldn't be bad.

Em                         G
You deserve the best, the gift of Chad!
   Em                          G
So come on lucky girl, let's sing along,
D
To Chaddy's awesome birthday song!
Em            G
Chad, Chad, Chaddy, Chad, Chad!