I am stuck on Puzzle 38

As the hints state, you should look in the middle (there's really only four possible bridges you could try)

A picture of the solution can be found here
http://professorlaytonwalkthrough.blogspot.com/2008/02/puzzle038.html

How do you get from A to B in one straight line, I have tried several times but it is incorrect.

If by drawing a line from A to B you mean from Start to Goal, you don't

You only have to draw a short line between the two islands (as indicated by the white arrow shown in the solution)

You don't even need to draw a straight line since the puzzle does that for you

Tap either of the two islands (a circle should appear), drag to the other island (until a second circle appears) and release

I've tried this a dozen times it's not working. It keeps saying I can't draw anymore lines. i JUST DON'T GET IT. iT'S DRIVING ME CRAZY!!! HELP!!!

As explained above, you only have to draw ONE short line where indicated in the walkthrough's solution picture (where the large white arrow is pointing)

The puzzle asks "where should your bridge go", so you only need to indicate where the one bridge should go

You do NOT need to draw more than one line (which is what the game is desperately trying to tell you when it says you can't draw any more lines)

You do NOT need to trace the entire route (which, of course, the question doesn't ask you to do)

You DO need to draw ONE SHORT LINE between the TWO islands

Once you've drawn the one short line between the correct two islands then just STOP since, well, that's it, there are no more lines to draw