Help me please!!!

[sutayaa]

dear sir
help me please knowledgeable people, i have one question please

How to make shop, when i add (buy) from item shop. can i do item add to char inventory when i click button (i) on keyboard ,because actually when i add (buy) from item shop to button (b) , weapon are random status.

How i do fix something for this?
Please Answer me please.

thank you very much sir.

[MentaL]