Need help finishing this

Hello everyone my name is Kareem and well i have this problem with this blueprint. This fine gentlemen who i believe is a staff member helped me through this but no matter what i try i can not seem to get this to work! so please take a look:

The other widget :

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Basically this is what i see when i hit play :

What im trying to do is have the buttons randomly spawn on that screen this is the size of the screen :

I tried everything but ■■■■ this is hard cant figure it out! please help THANKS!