create a save of coins taken

hi guys i need your help.
how can i create a coin save that is worth on all levels?
at the moment I am using this code but every time I go back to the menu it resets the value of the coins based on how many I have collected in the last level played, while I would like you to add them to the last save.

thanks in advance to those who help me

Maybe the ToString is not needed when you assign to the Text Object

As you can see is GlobalVariableString(HScore)

sorry but i’m new, could you kindly explain to me what i need to change in my code