Dear Tasmia M,
According to your problem:
Please try following method:
In the folder list, right-click on the name of the folder you wish to share and choose Properties. On the Permissions tab of the new window, click Add. Type the name the UW employee that you wish to receive access to your shared folder. Once the correct individual appears in the search results, make sure their name is highlighted and click Add. Their name should now appear in the field at the bottom. Then click on the Permission Level dropdown box to choose the level of sharing privileges you wish to. (Publishing Editor gives them full access to read the contents, add new emails, delete emails, and create new subfolders. )
Please be aware that any new subfolders you create will inherit the existing permissions of their parent folder by default.

Please try on the OWA, maybe you should wait in outlook.