1- Create an event to submit your score.
2- Export your project for Scirra Arcade.
3- Upload your project zip file on Scirra web site.
4- Enjoy.
You must click on a point before:
It works for me. If you post your capx, I could take a look at it.
Maybe the manual could help you.
Something like this?
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Look at the Touch expressions in the manual https://www.scirra.com/manual/119/touch
Maybe something like this could do the job:
Did you make your rails <Solid>. Maybe you can post your capx.
It's a very good method to use. Even if the tutorial is very well done, maybe you will have some problems implementing it if you don't have any experiences with MySQL & PHP.
For the movement, look at this post
I don't exactly understand what you need. How do you know which player is touching the screen? Where do you want to move the player object?
You could try something like this:
Member since 7 Sep, 2014