So the notes of the A7sus4 Chord are: A, D, E and G
The A7sus4 chord chart diagram below will illustrate how to finger this chord on your guitar.
Here is a key that will help you read the chart:
Everything on the above chart should be self explanatory, except for the last three in the third column. They may need a bit of explaining. The O, or open symbol, simply means that you do not press down on any notes on that string. The X means you do not strum that particular string. The Barre symbol means you need to barre that particular fret. When you barre a fret you are pressing down on multiple strings at the same time with one finger.
A7sus4 Video Demonstration
Chord Playing Tip: Be sure that you are pressing down on the strings hard enough. You should play each string one at a time to make sure you have a nice clean sound. If any of the strings buzz or sound muted, then something is not right.