How to add a number to a variable?

[TVTRex]

Im trying to make a clicker game and add a number to a variable and its not working, if you how to do that then could you please say how or link a video on how to.

 

[Mipoxa]

Im trying to make a clicker game and add a number to a variable and its not working, if you how to do that then could you please say how or link a video on how to.

refer to what I said in this post https://mcdiamondfire.com/threads/how-do-you-use-variables.9525/post-27335