The D Major 7th Chord is found by locating the 1, 3 , 5 and 7 positions (D, F#, A and C#) of the D Major Scale: D E F# G A B C# D. The chord diagram chart below demonstrates how to play the DMaj7 Chord.
Here is a key that will help you read the chart:
DMaj7 Guitar Chord Video
The video below will further demonstrate how to correctly play the DMaj7 Chord. Enjoy!