How can i rebuild the source of the server/client? also can i delete the source so it wont be in client?

You need VB6 to change/edit the source code.

When you distribute your game, you just want to give players the client.exe and the data folder. The source is not needed for the game to run, you only need it to compile a new exe.

i have visual studio 2015 but thereisnt a project to open the source

You have to use the VB6 IDE, VS won’t work.

ah ok thank u