Set Shared folder for [C:\Share] as everyone can read and write.

[1] Right-Click target folder and select [Share with] - [Specific People].

Use a folder on D.
Data in C is not recomended.

[2] Select a user (everyone on this example) and click [Add] button.
[3] Select Permission level for the user you just added (Read/Write on this example) and then click [Share] button.
[4] Click [Done] button to finish configuration.