Hey, Bob.

Anyway you can get the notes to sound is fine.  I encourage you to continue to work on the traditional way to fret the chord, as well as other ways!  Eventually you have to use the chord with other chords in musical examples.  So you'll find that different ways of fretting chords are more effective in making certain changes.

For example, getting from the standard C major to F major is much more efficient if you use the index, middle and ring fingers.

But to play any chord all you really need is the 1st, 3rd and 5th scale degrees.  So you can play an F major like this:

|-------------|
|--1-(5th)----|
|--2-(3rd)----|
|--3-(1st)----|
|-------------|
|-------------|

Or this:

|--1-(1st)----|
|--1-(5th)----|
|--2-(3rd)----|
|-------------|
|-------------|
|-------------|

Or this:

|-------------|
|-------------|
|--2-(3rd)----|
|--3-(1st)----|
|--3-(5th)----|
|-------------|

The standard form is just the traditional way that players form the chord to make effective use of the strings (root notes on bottom and top for full sound) especially when combining it with C major and G major.

|--1-(1st)----|
|--1-(5th)----|
|--2-(3rd)----|
|--3-(1st)----|
|-------------|
|-------------|

But all of these are legitimate ways of playing an F major chord.

Regarding the Chord Finder.   The numbers indicate fingers (1-index, 2-middle, 3-ring, 4-pinky), the red circles indicate the root notes of the chord, the white circles are the the other chord tones (3-5-7, etc.).

Hope that helps!