I can't post URL's yet, so you'll have to replace the "DOT"s with actual fullstops.
It's a tutorial page on scirra's site which is suppose to show you have to create save files and load the save files.
I haven't read the tutorial yet - only been using construct 2 since yesterday, anyway, hope it helps!
URL:
www DOT scirra DOT com/tutorials/526/how-to-make-savegames