I think you need to show what you have tried that didn't work. Maybe just a screen grab of the event that does the saving/loading?
See the attached capx for a simple example. Hope it helps.
Edit->
1. Enter a value
2. Click Save
3. Enter a different value or delete it
4. Click Restart to load last saved value
I just noticed your comment about functions. I also have used very simple 1 or 2-liner functions in the sample. I think you should definitely use them. They aren't hard. Maybe you can use my example as they are very basic. They also stop events running 'every tick'.
I also included a "Log" function. If you want, delete the 2 "Call 'Log'" lines and also the Log function, to simplify the sample even more (but logging is essential for debugging IMO).